My experience:
FF5 not any faster and takes 20mb more memory at start up.
Plus the fucking memory leak is back that FF4 actually managed to curb.
Same ol memory leak here too, disapointing.
What sort of hardware are you guys running? I agree about the extra memory being used at startup... But I don't see any other memory issues.
The reason I ask is because back when I was using 2gb of RAM and a 1.6mhz processor: I had all sorts of gripes about FF and memory usage.
Now that I have gobs of ram and a fast dual core processor, FF works just fine (other than the extra 2 seconds it now takes to load with FF5.)
^ Are you using add-ons? Without any add-ons running, I used firefox 5 for 2 hours. Then I opened 40 tabs, average sites on 30, but then for the 10 others I had 10 youtube videos playing at once.
It didn't crash or anything and I could switch between tabs almost at normal speed. Firefox.exe was at around 800 MB. The plugin-container.exe that they use for flash and stuff was 600 MB, though. Going down to one tab brought the two processes combined to 330 MB. This was on a machine with a 3.2 ghz dual core and 4 gb ram.