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x64 is all about Memory dude, 90% of the machines at my workplace have 4GB of RAM or more, yet we're still on XP32, thank god there's testing for Win. 7 64/32 going on. Why do you think people get a 64 bit OS in the first place? 99% of the time it's to use 4GB of RAM or more.

in another word i mean .... there are the performance factor

64bit perform faster in cpu intensive tasks!

It misses the word "yet". Right now systems are able to run both 32 and 64 bit software at the same time. In this case it really doesn't matter if a webbrowser is 32 or 64 bit. However, we might see 64 bit only systems in the future which causes a need for 64 bit webbrowsers as 32 bit can't run on those systems any more. Maybe that'll be sooner as some operating systems/webbrowsers have a setup in which they can't use 32 or 64 bit plugins in the webbrowser which is 32 or 64 bit. Compatibility and the ability to be able to use the webbrowser with the plugins is the reason why a 64 bit browser can exist and needs to exist. It's not always about the 64 bit features ;)

That will be more than a decade away at the minimum, we've only just dropped 16bit support and Windows has been 32bit since 1995.

in another word i mean .... there are the performance factor

64bit perform faster in cpu intensive tasks!

Simply compiling the code as 64bit doesn't make it faster, there's work to be done.

Case in point, 64bit builds of release versions of Firefox are slower than 32bit builds.

The JIT engine that powers Tracemonkey only gained a 64bit backend recently, 3.5 and 3.6 still only have a 32bit backend (Actually, not entirely sure about 3.6, but I know 3.5 doesn't have one)

That means a 64bit build of Firefox uses the interpreter, while a 32bit build uses the faster JIT.

The JIT engine that powers Tracemonkey only gained a 64bit backend recently, 3.5 and 3.6 still only have a 32bit backend (Actually, not entirely sure about 3.6, but I know 3.5 doesn't have one)

That means a 64bit build of Firefox uses the interpreter, while a 32bit build uses the faster JIT.

anyhow

i believe they are building offical build. for FF3.7

all those prev. build were unoffical builds

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