I think that browser developers are optimizing the wrong thing. Specifically: they optimize for execution speed while they better optimize for minimum memory usage instead. Let me explain why this is more important. Let's say I am visiting a properly made website and it takes 10% of CPU to render. Even if browser devs make their browser twice faster, it will only save 5% of CPU time - and that would be completely unn…
As much as I want them to optimise for memory usage. Taking less CPU time for rendering is extremely important for battery.
Not to mention faster site is noticeable. And that is what sells. Chrome was faster than everything else when it launched. ( May be apart from Opera )