It may prove to be a very stupid idea, but this article is my attempt to talk reasonably about a topic that has so far spawned 100% unreasonable flamewar-filled bikeshed discussions.
A lengthy, yet highly informative, and very in-depth article on why exactly JS-heavy web apps run slow on mobiles. Goes into depth on garbage collection vs. reference counting to finally point out why it all doesn’t match up with JavaScript on the mobile.
If you are a web developer, think about the iPhone 4S Nitro as IE8, as it benchmarks in the same class. That gets you in the correct frame of mind to write code for it.