Issues with the 4th release of Firefox

I’m using Firefox for almost 6 years now – since the v1.0 – and consider myself a fan but, after the 4th stable, I’m thinking that it may be the time for me to migrate to a better browser, like Chrome. Actually this is not the first time I’m thinking to switch to Chrome, which attracted my attention even at it’s initial release. Only thing preventing me is its lack of native proxy management, particularly SOCKS support. Hope they implement that future soon and save me from Firefox.

Anyway, here are the problems I’m encountering with Firefox 4 so far:

• It is slow.
  I read everywhere how fast Firefox 4 is, beats this on X test, smokes that on Y etc. Unfortunately, this is not the case for me. In my experience, Firefox 4 is a memory hungry piece of junk. I don’t care how fast is its new javascript engine or how effective its fancy hardware acceleration techniques, if it needs to consume more than half of the installed memory on my system to do that. I’m getting hard time to understand how a software, which drives the system to a swapping death, can be considered “fast”?
  I know, Firefox may seem slower to me because of my old PC and the plugins I’m using, but I’m not going to accept these as excuses. If I’m able to use the latest version of Chrome (+plugins) without any problems on the same computer and was satisfied with the performance of the previous version of Firefox, it’s the Mozilla to blame, not my PC.
• It fails to render Helvetica fonts correctly.
  Although it has been a known issue in the beta releases, looks like Mozilla didn’t care to fix it in the stable. Annoying.
• F6 is not working.
  I like using keyboard shortcuts and F6 was one of my favorites. It’s function was ( and still is on other major browsers like Safari, Chrome and Opera) to highlight the address bar for input. Now it only selects the current tab. Useless and annoying.