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Consider the following task: you have UI widget and you will need to draw something on it. Something that cannot be trivially expressed by CSS means.

What will you do in native application?

You will put custom drawing code (C/C++/Rust/Go) in WM_PAINT/onPaint/onDraw method of the widget. If in Sciter[1] then you can do event_handler::handle_draw(graphics* pgfx) - Sciter's applications are native ones.

This will be fastest and most lightweight way of doing such things.

Now, what will you do on Web platform (browser or Electron)?

Calling server (over TCP - browser, RPC - Electron) for providing a drawing is clearly not an option.

So you will make some <canvas> element where you will draw that thing. <canvas> is a bitmap based thing so you will have that bitmap allocated as in CPU memory as in GPU memory. Plus you will have some nontrivial setup to position that <canvas> where you need it.

Therefore you will have at least memory requirement increased for your app (if to compare with native/sciter app).

Note that modern browser uses separate process for each tab. So you will have at least 3 processes running your application. That's also about memory and CPU consumption needed for RPC between them all.

And what if that thing that you will need to draw is not that trivial - will be heavy for script to handle...

And so you will start to add JIT to your script engine. That will need more memory and CPU (at least for bootstrap). Otherwise some smart people will propose you to use WebAssemble for that, so you will load WebAsm VM into your application...

See where it goes?

To create obstacles for yourself to overcome them heroically, right?

If that is for you personally then you can do whatever you want. But you want to put that burden to your users ... And so as many users as many machines converting that needles payload to heat without doing anything extra of what native applications can do already …

[1] https://sciter.com

> See where it goes?

To a state where users need a (another) datacenter to access/view/use even trivial apps with “reasonable” responsiveness. There are services already being offered to this end [1].

[1] https://mightyapp.com/

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