
Show HN: JS library to make your website instant - dieulot
http:&#x2F;&#x2F;instantclick.io&#x2F;<p>It seems the internet architecture won&#x27;t bring us instant websites anytime soon. So here is a hack.<p>I released this JS library last month (today is version 2.0 release, fixing v1.0&#x27;s rough edges), it makes use of HTML5&#x27;s pushState and preloading to make a website instant.<p>It works like this: before clicking on a link, you&#x27;ll hover over it. And there&#x27;s a delay of 200-300 ms between these two events. InstantClick uses this delay to preload a page, when you click on a link it will display instantly in most case. (You can test on the website.)<p>That&#x27;s similar to pjax and Turbolinks, for it uses HTML5&#x27;s pushState and Ajax. And preloading is thrown into the mix.<p>In case preloading all the links that a user hover over is too much work for the server, there&#x27;s also an option to set a delay before preloading kicks in, or to preload on &quot;mousedown&quot;. Mousedown is when you press your mouse button (a click is when you release it). This way you still get a slight &quot;magical&quot; speed advantage, and pjax&#x27;s benefits (notably, no recalculation of scripts&#x2F;styles on every page change).<p>For mobile it preloads on touchstart, so you get 400 ms to preload. This is different from FastClick: with InstantClick a user can still double tap to zoom without triggering a link.<p>As said in the first sentence, the internet architecture can&#x27;t bring us instant websites today or tomorrow. So I think this — InstantClick — could be a pretty big thing to improve the situation at scale.<p>The main challenge I see is that existing JS scripts may not work with it out of the box. I don&#x27;t do much web development nowadays though, so I don&#x27;t know how big of a problem that is, and I don&#x27;t know if there isn&#x27;t any other major barrier in the way to make this mainstream.<p>That&#x27;s why I&#x27;m awaiting your opinion, smart folks of HN.
======
VeejayRampay
Another idea: take into account the movement of the mouse to define a
directional cone in the general direction of the movement, which would enable
you to preload your pages even before the hover state occurs.

~~~
devgutt
Amazon have done this to improve the performance of dropdown menu.
[http://bjk5.com/post/44698559168/breaking-down-amazons-
mega-...](http://bjk5.com/post/44698559168/breaking-down-amazons-mega-
dropdown)

~~~
joshuahhh
That article says nothing about preloading pages. The speed gains are purely a
UI thing -- if you're clever about keeping submenus open even when the mouse
leaves the submenu's entry in the main menu, you don't need to provide a delay
for menu opening/closing.

~~~
dmethvin
I think the Amazon example was being used as an example of the "directional
cone", not preloading.

------
CoryG89
After looking at the source, one thought I have is that since you are dealing
with such small timescales you should use the high resolution
window.performance.now function (or the Date.now function for higher
compatibility) as a timer instead of using the Date object as you do.

~~~
dieulot
Thanks, I’ll look into it.

------
wesley
I wish there was an instantclick link to this website..

OK, here it is: [http://instantclick.io](http://instantclick.io)

------
callesgg
Realy Cool, Only real problem with this is if the clicking has side effects
like: [http://example.com/?action=logout](http://example.com/?action=logout)
as brought up on page.

And probably a ton of other application bugs as style and script stuff wont
load. like they normally would

~~~
dylz
Modifying session state should be a POST, not a GET.

~~~
nimish
It ought to be a PUT since it's idempotent but still modifies state.

It definitely should not be a GET, since good practice says that GET is
idempotent
([http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html](http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html))

Nobody ever follows this since we all want stuff like
www.example.com/articles/latest to respond to GET and also have different
content depending on time. The distinction is at the core of the REST
abstraction and it's an art.

~~~
derefr
Oh, are we talking HATEOAS session support?

    
    
        # if you don't have a session token yet
        POST /session-tokens # Accept: application/json
          => 200 {"token": "someuuid"}
    
        # no cookies set!
        # stuff the session token in localStorage instead
    
        # now use it
        PUT /sessions/someuuid # with your login details
          => 201
    
        GET /sessions/someuuid/inbox # Accept: application/json
          => 200 {...}
    
        GET /sessions/someuuid/inbox # again
          => 304 # wow much cached
    
        # meanwhile
        GET /sessions/otheruuid/inbox
          => 200 {...} # other user: other memcached prefix!
    
        # pages that won't change per-user...
        GET /home
          => 304 # can be cached globally
                 # (use JS client-side, not edge-side, includes)
    
        # and finally...
        DELETE /sessions/someuuid
          => 301 /home # log out!
    

Basically, a session is just another _resource_ that you create and then
manipulate using its sub-resources. This makes all sorts of things easier:
creating session tokens and attaching sessions to them (by logging in, or as a
guest) are separate steps, so you can throttle logins at the just by
throttling access to the token generator. No cookies and no ESI means caching
(reverse-)proxies can actually cache. (Note that I'm presuming TLS and
hygienic CORS here, so "session stealing" isn't a valid complaint. Or rather,
without those things, it's just as valid a complaint for a cookie-based
approach.)

Oh, but as a postscript, one little HATEOAS bonus tweak:

    
    
        POST /session-tokens
          => 200 {"token": "/sessions/someuuid"} # no constructing URIs!

~~~
dfabulich
Don't do this in real life. Putting session IDs in URLs is not a good security
practice. (Session fixation. Users might try to share links containing session
IDs. Session IDs leak out via URL history and referrers; URLs show up in the
darndest places.)

Roy Fielding thinks that server-side sessions violate the REST constraint.
[https://groups.yahoo.com/neo/groups/rest-
discuss/conversatio...](https://groups.yahoo.com/neo/groups/rest-
discuss/conversations/topics/3583)

Some people (maybe you) think he's wrong; why can't sessions just be a
resource? (And this just goes to show that nobody knows what "REST" really
means, and that this question doesn't matter.)

But if you're willing to treat sessions as resources, there are good security
reasons to use cookies to refer to them, ideally in addition to a separate
non-cookie ID parameter, to prevent CSRF attacks.

Cookies have some performance benefits, too: they can save you round trips to
the server. If I want to display fresh personalized session-specific content
on my /home page, why should I force the client to download a generic /home
page, then download my JS, then run an AJAX request, when she could just send
a cookie in the initial request for /home and get back an (uncacheable)
personalized response?

~~~
derefr
> If I want to display fresh personalized session-specific content on my /home
> page, why should I force the client to download a generic /home page, then
> download my JS, then run an AJAX request, when she could just send a cookie
> in the initial request for /home and get back an (uncacheable) personalized
> response?

Your server shouldn't have to do O(N) units of work to serve a static page to
N people. The entire _point_ of GET-idempotency is that you can reduce serving
your home page to O(1) units of work _for you_ : you render the page, once,
and it gets cached by a CDN, like Cloudflare. This necessitates customization
either on the client-side, or not at all. Doing anything other than these is
breaking the web[1].

(Besides, you don't necessarily have to do an AJAX request for every
previously-would-have-been-customized page. Edge-side-include type stuff (e.g.
username+id, viewing preferences) is, literally, what localStorage was created
to store. You only have to get that type of stuff once.)

> Session fixation. Users might try to share links containing session IDs.
> Session IDs leak out via URL history and referrers; URLs show up in the
> darndest places.

As I said, proper TLS and CORS (where things like adding "noreferrer" to all
external links is as much a requirement for proper CORS as not loading
external images) generally takes care of this.

But you're right, there is a use for cookies. It's not to hold your session
token, though. Instead, it's to hold a _client fingerprint token_ , given to
the client the first time they speak to you.

A client fingerprint is anything that _authenticates_ a session token. If you
say "give me /sessions/foo/..." and you don't send foo's associated
fingerprint, the server 403s you at the load-balancer level.

Session fingerprints are already a common concept: some people use the user's
IP address, or their browser UA string, or something, as a fingerprint. These
have a pretty horrible UX, though, because these things can change
unintentionally (e.g. a mobile connection switching cells.) But users expect
that clearing their cookies will log them out of things, so the cookie store
is a pretty good place to put these. Then, leaking a URL with the session
token does nothing, because it doesn't share session secret (the fingerprint),
just the identifier.

How is this different from just putting the session token in the cookie store?
Mainly in that the client fingerprint doesn't represent _you_ , it represents
_your machine._ The point of it is to pair your browser to the server. You can
log in and out as many times as you like, but it'll all happen under the same
"client."

Note that if browsers actually chose to start emitting a unique, persistent,
per-site client fingerprint as a header (like the iOS "Vendor/Advertising
ID"), this would supplant the _client fingerprint token_ \-- but do nothing to
replace the session token. They're separate things.

Note also that while the session token is part of the URL (and thus part of
determining cacheability), the client fingerprint isn't. This should be
obvious, but its implication isn't, necessarily: past your load balancer
(which authenticates sessions against client fingerprints) _cookies_ cease to
exist; they should not be passed to your backend servers. The client, and your
backend, operate on pure resources; the client fingerprint becomes a
transparent part of the HTTP protocol, invisible to both sides. Gives a much
stronger meaning to "HTTPOnly."

\---

[1] And it's not that it's bad to break the web, really; you're not hurting
anyone else's site than your own when you do this. It's just that HATEOAS
gives you some really great guarantees, and pretty much everyone who throws
these guarantees away finds themselves re-building the web on top of itself to
try to get these guarantees _back._

Matryosha caching middleware, for instance, is what you're forced to deal with
when you're trying to build up a complex view within the scope of a single web
request. If you instead just use a service-oriented architecture, where each
service that needs information from sub-resources makes requests through the
public API of the web server (the same one you want clients to use), you'll
get caching automatically, because all the sub-resources you're requesting are
inherently cacheable, and thus automatically cached.

~~~
dfabulich
TLS doesn't address session fixation. (And certainly neither does CORS or the
same-origin policy generally.)

Client fingerprinting (with cookies) does address session fixation. But but
but didn't you just get through saying how wonderful your solution is because
it doesn't use cookies?

If you're happy to use cookies and link them with server-side sessions, then
just do that. (Just don't tell Roy.)

And when you need maximum performance, don't force the client to do multiple
round trips.

> You only have to get that type of stuff once.

Most visits to public-facing web pages have a cold cache. Maximizing for warm-
cache performance at the expense of multiple round trips for cold-cache
performance is probably the wrong thing, but only A/B testing and RUM will
tell you for sure.

------
maxucho
Awesome work! I just installed this in my own new experimental (read: very low
traffic) web app: [http://www.penngems.com/](http://www.penngems.com/)

I set the preload to occur on mousedown rather than mousover, as per the docs,
but even with this I noticed near-instantaneous page loading.

~~~
dieulot
Thanks for the feedback.

~~~
thenomad
Just testing that site (thanks to maxucho for providing the example :) ).
Interestingly, even if I hold my mouse button down for a second or two before
releasing it, there's still a perceptible loading time of maybe 500ms - 1s.

Not sure if that's expected as part of the design?

~~~
dieulot
Definitely not. May you tell me how old is your computer, and which browser/OS
combination you use please? Either here or on GitHub:
[https://github.com/dieulot/instantclick/issues](https://github.com/dieulot/instantclick/issues)

Also please test how it goes when you press for like 5 seconds.

------
primitivesuave
One way I see to move this forward in websites at scale is to run a test where
you find out the percentage of hovers that result in a click. Suppose its 90%
- that means that 10% of those hovers result in fruitless busy-work for your
server. Multiply bandwidth + server cost by 10%, and compare that amount to
the amount you'd be willing to pay for near-instant load times.

For many companies (Facebook, Twitter, etc) the desire for instant user
gratification is paramount, so the push toward instant browsing experience is
a very real possibility. One problem is that most people wouldn't really
notice, because these websites load pretty quickly as it is.

One interesting direction is if there was some kind of AI in the background
that knows what pages you're likely to visit and preloads them - Facebook
stalking victims would become an instantclick away.

~~~
dieulot
Yep, I’d like to get statistics on the additionnal load.

For answering your second paragraph, note that even small gains in speed have
a direct effect on user engagement. Google and Amazon have noticed so:
[http://www.uiandus.com/blog/2009/2/4/amazon-milliseconds-
mea...](http://www.uiandus.com/blog/2009/2/4/amazon-milliseconds-means-
money.html)

------
dmazin
By the way, if you don't want to listen to mouseover, merely listening to
mousedown takes 50-70ms off loads [1]. Not ignorable.

[1]
[https://github.com/rails/turbolinks/pull/253#issuecomment-21...](https://github.com/rails/turbolinks/pull/253#issuecomment-21247888)

~~~
dieulot
You’re right. And InstantClick does that too. ;)

------
adwf
Really awesome. I was working on something like this myself, but using Jquery
ajax combined with history.pushState for partial page loads. This is much
better!

There are a couple things that I had on my TODO list that could be handy
though:

1) Caching - if you hover back and forth over two links, it will keep loading
them every time. Dunno whether this can be alleviated or not.

2) Greater customisability. It'd be great if I could customise whether it was
a hover or mousedown preload, on a per link basis. Some links benefit from
hover, others it might be overkill.

3) Lastly, it would be cool if it could link up with custom actions other than
just links. For example, jquery ajax loading a fragment of html to update a
page. This is probably lower down on my priority list though, as the full page
prefetch works remarkably fast.

Keep up the great work!

~~~
dieulot
Thanks.

Caching can be done server-side, this is not something I plan to implement.

The last two seems like things that wouldn’t be needed very often, so they
probably won’t make the cut either.

~~~
adwf
Yeah, I didn't know whether it was worth it on the caching, I'd already turned
on a 5 second cache-control just to eliminate this kind of quick back-and-
forth mouseover on a list ;)

------
snitko
While interesting, I think this kind of functionality should be implemented
only by browser developers and should be turned off by default. Really, I can
wait 1 second until the site loads. What I don't want is some library
accessing sites without my permission. I usually place mouse over links to see
what URL it points to and I sometimes do not wish to click.

~~~
dieulot
It works only with links from the website you’re on. When the domain or
protocol is different InstantClick don’t (and can’t) preload it.

~~~
hrjet
I don't get the "can't" part. Surely you can load it as an image or iframe?

~~~
dieulot
Sure, I meant “preload” in the InstantClick sense: getting it ready to replace
the DOM.

------
pokstad
I have an even better hack. Since most blog posts / articles are nothing more
than a bunch of text, I simply download all articles in a single fetch when
the initial page loads. I do this using a CouchDB view that returns all blog
posts in chronological order. All successive link clicks don't hit my server
(unless there's an image in the article that needs to be loaded). Check it
out: [http://pokstad.com](http://pokstad.com)

~~~
sjwalter
FYI
[http://pokstad.com/db/75253f5cc6fda4538c5f9116407d0b4c/index...](http://pokstad.com/db/75253f5cc6fda4538c5f9116407d0b4c/index.html)
is broken. [Object object]

~~~
pokstad
It's still under active development ;)

------
soundoflight
Prefetching really shouldn't be blindly applied to everything as users may
have bandwidth limited. Even though your implementation is better than browser
prefetch on users it does take the choice away from the user unless individual
sites make it easy for users to opt out.

~~~
dieulot
I think that if you stop hovering fast enough and the request is cancelled,
you’ll end up only sending headers, thus not affecting bandwidth that much.
Not sure though.

If not the case, note that it’s just HTML we’re wasting. In the grand scheme
of things it seems to me it would not have that much of an impact on bandwidth
usage.

~~~
dclara
I think it may impact on the bandwidth usage on mobile significantly.

~~~
samhoggnz
On mobile you don't have a hover state so surely this would be less of an
issue.

~~~
soundoflight
Mobile as in PC over cell network you do.

------
w1ntermute
Doesn't Chrome already do something like this?

~~~
dieulot
You may be talking about this:
[https://developers.google.com/chrome/whitepapers/prerender](https://developers.google.com/chrome/whitepapers/prerender)
Or this: [https://developer.mozilla.org/en-
US/docs/Link_prefetching_FA...](https://developer.mozilla.org/en-
US/docs/Link_prefetching_FAQ)

The main differences are that InstantClick preloads just before you need a
page, so you can be more liberal in what you preload. Also pages are more
recent, useful if you’re serving dynamic content.

------
lmartel
This is very cool!

One interesting reaction I had: things loaded so fast that I didn't notice one
of the page changes and thought it was stuck. For sites like this one where
different pages look very similar, maybe it could be worth experimenting with
some sort of brief flashing animation (to make it look like a real page load)?

~~~
dieulot
Yes, I was thinking about something in the like of NProgress:
[http://ricostacruz.com/nprogress/](http://ricostacruz.com/nprogress/) If the
page is displayed instantly, show a complete bar that disappears. (I’m not
sure if that would solve the problem, I may explore different solutions.)

------
d0ugie
Note that the author, Alexandre Dieulot, opted generously to release this
under the MIT license (thanks buddy).

[https://github.com/dieulot/instantclick/blob/master/LICENSE](https://github.com/dieulot/instantclick/blob/master/LICENSE)

------
ishener
i still don't understand why in 2014 it's not possible to have an entire
website with all it's files zipped and shipped as it is on the first request.
how wasteful is it to have 50 requests for a server just for images and
resources? have your root domain be a zip file of everything you need to view
it, and then include some additional popular pages along with it. it can't get
any faster than that

~~~
sp332
Well, why not? You can inline everything (including images with data:// URIs)
and zip it up. Apache can serve the static zip file to browsers that support
it [http://stackoverflow.com/questions/75482/how-can-i-pre-
compr...](http://stackoverflow.com/questions/75482/how-can-i-pre-compress-
files-with-mod-deflate-in-apache-2-x)

------
p4bl0
I'm not sure it's working for me, I don't see any special network activities
in Firebug while using the website.

Also, you should take into account the focus event of links, I tried and it
seems you doesn't when trying on the "click test" page to tab tab tab on the
test link and then hitting enter.

~~~
dieulot
Focus isn’t used a lot, so it’s not worth the extra complexity in code.

~~~
p4bl0
I don't know how instantClick is implemented, but to me attaching some
callback to a second event is not added complexity, it's just a few duplicated
lines of "administrative" code.

------
westiseast
Nice! I used pjax for a Chinese-English dictionary project, and it was nice,
very very fast.

As you mention with JS scripts not working, I had to do things like rebind
functions when pjax finished, or load new JS snippets along with each HTML
(page) snippet. Not too huge a compromise.

------
AshleysBrain
Isn't this what link rel="prerender" does?
[https://developers.google.com/chrome/whitepapers/prerender](https://developers.google.com/chrome/whitepapers/prerender)

~~~
dieulot
Nope, see my comment below:
[https://news.ycombinator.com/item?id=7201537](https://news.ycombinator.com/item?id=7201537)

------
robgibbons
I would be hesitant to rely on mouse input, or even touch input. Think about
things like screen readers and accessibility and you'll quickly learn there
are many ways people browse the internet.

~~~
dieulot
It should degrade. No mouse/touch: just pjax, without preloading. No
JavaScript or no pushState: standard hypertext behavior.

------
ruricolist
The tricky thing with all of these (pjax &c.) is that by loading with
JavaScript, you lose progressive rendering, so while reducing latency you may
actually lose perceived speed.

~~~
dieulot
Correct, this can actually be detrimental for low-bandwidth users, or if the
website have enormous pages.

------
romanovcode
So this is like a fork of TurboLinks? I've made this thing myself for website
I use in couple of minutes. I would probably not rely my whole website on this
plugin.

------
lifeformed
Is there a demo page? I want to see what it feels like.

~~~
dieulot
The website it is.

~~~
yogo
Good stuff, but I don't think this website is big enough to demo the benefits,
maybe a heavier website is needed. A properly configured web server as well as
the right HTTP headers will give you the same speed, _perceptually_.

Also you might want add some kind of tracking to avoid making repeat requests
(probably within a timeframe). For e.g. hovering one link, then changing your
mind, then going to another link. The browser will smartly pull it from its
cache but this lib is still making the requests.

~~~
mooreds
I just added it to my database driven website that is run off shared hosting:
[http://coloradocsas.info/](http://coloradocsas.info/)

It doesn't _feel_ that much faster, but I'd love a way to verify speed changes
with data.

~~~
jwcrux
I'm watching via the dev console and don't see any requests being sent out on
hover. Are you sure it's working?

~~~
mooreds
I took another look and I wasn't doing the init(). I am now, but it still
doesn't appear to be working. Not sure why.

~~~
dieulot
You’ll need to enable blacklisting, see
[http://instantclick.io/start.html#whitelist_blacklist](http://instantclick.io/start.html#whitelist_blacklist)

Sorry, my copy was previously unclear about that point.

------
auvrw
> before clicking on a link, you'll hover over it.

unless you use vimperator or similar. the demo handles this though, giving a
hover time of infinity.

------
wiradikusuma
Does it work with SPA, particularly using AngularJS? (Essentially what's
needed is the "prefetch on hover")

~~~
dieulot
I haven’t tested, but I don’t think so. Creeping in the standard browser
behavior is easy enough, but an SPA may likely need to reimplement
InstantClick’s logic specifically for it.

~~~
pt
Yeah, just tried it. Does not work with angular SPA.

------
napolux
Wonder what happens for website with zillion of visitors per day. Could all
this preload impact on servers?

~~~
aphexairlines
Predictive prefetching (similar to the work here, but more aggressive) did
impact the servers on a zillion-visitors mobile commerce site at first, but
it's fine now. Tuning helps.

More than scaling, the larger headaches come from migrating all your existing
logging to account for preloading versus impression hits.

~~~
dclara
Oh, good point. CPC is based on the user clicks, i.e., fetching.

------
loteck
Am I correct in assuming that touch interfaces can't benefit from this kind of
architecture?

~~~
dieulot
You are. Preloading on touchstart is something that I plan to work on soon
though.

~~~
tmzt
It's not really a hardware limitation. The Galaxy S4 can detect an almost
touch but there's no browser event for it.

------
oneeyedpigeon
Wouldn't this ruin usage stats?

~~~
sunir
Careful. Usage trumps usage stats. If the user experience is better, the stats
will adapt.

~~~
corin_
It doesn't trump the ability to record stats. When it comes to business there
are certain things you can't do without, for most sites (that are big enough
to matter) stats are absolutely required, no improvement on usage would be
worth losing stats for.

(Not talking about this project in specific as it seems stats can be made to
work with it, just replying to the idea in your comment.)

------
lintiwen
I have problem understand "instant website",

can you provide some specific definitions? thank you

------
thasmin
Have you considered preloading all of the links while the person is reading
the page?

~~~
dieulot
For sure. But you get way less bang for your buck that way.

------
matysanchez
Any demo? I mean, a implementation in a real web, like a blog or something
like that?

~~~
dieulot
Unfortunately none that I know of.

------
udfalkso
Very nice. It would be great if the JQuery Mobile folks would integrate this.

~~~
grobmeier
Good idea. Pre-Loading a page when you hover a link with your finger.

------
kjannis
Does this require server components? Or does it also work with a static site?

~~~
dieulot
It just requires the 1.6kb JS file. :) So yes, it works on static websites
(instantclick.io is hosted on GitHub Pages).

------
mbesto
In theory you could write a chrome extension and use it for any site, right?

~~~
dieulot
Sort of, see my comment below:
[https://news.ycombinator.com/item?id=7201725](https://news.ycombinator.com/item?id=7201725)

~~~
mbesto
Cool, and it only works on GET responses right? So I don't have to worry about
hitting "Delete" or "Save" on a web app by hovering.

~~~
dieulot
Right. If the “delete” or “save” button isn’t a link it won’t get preloaded.

------
aehv
Is it possible to make it a Chrome extension and use it on all sites?

~~~
dieulot
I think it is possible for a subset of websites (because you can’t preload all
links by default, some trigger an action such as a logout), that’s an idea I
had in mind.

~~~
aehv
I pasted the js code into a userscript.

Works great! I hope I won't have too many accidents with it.

I remember using 10 years ago a similar Windows program that preloaded all
links.

------
sagargv
Awesome ! I can't believe I hadn't thought of this before.

------
wololo_
Does it support /#!/ (hashbangs) or just pushState ?

~~~
dieulot
Just pushState.

------
davidslv
I couldn't manage to see anything special.

------
resu
This is really cool! I'll try it out.

Thanks for sharing :)

------
toddwahnish
This is fantastic - will definitely use this!

------
mrfusion
Love it! Will it only work on html5 sites?

~~~
dieulot
It works with every websites.

~~~
Kiro
Flash?

~~~
liviu
Flash in 2014?

------
augustohp
Extra kudos for not using jQuery!

------
insertnickname
>Click − Hover = ∞

>Click − Mousedown = 2 ms

>Click − Touchstart = ∞

I win!

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math0ne
umm like 40% of traffic is already touch, seems too late

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dieulot
Preloading on touchstart is planned.

Also note that percentages like that don’t tell the whole picture; non-touch
traffic hasn’t decreased by “like 40%”.

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aabalkan
Is there a demo?

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dieulot
The website it is.

