Locally I see so many companies building good looking but horrendously optimized websites for their clientele who don't know enough to ask for it.
The last company I worked at were building a local search engine and were displaying thumbnails whilst loading full size pictures which were hot linked from businesses websites. With an auto loading feature at the bottom of the page by the php backend, an initial 5-6 Mb page load could turn into 30+ Mb within a few seconds of scrolling. Add to this no gzipping and caching was not properly configured either.
I tried my best to get some changes going but the senior (and only other) dev wouldn't allow any modifications to the current system "for the moment". It was a bit frustrating to see so many easy fixes ignored.