This is either a program driver conflict that you installed (my guess) or its your system's hardware that's having problems
because I'm running build 7057 x64 & it's even faster than the 32bit version on my system!!!
You might have downloaded a version that's been hacked with a backdoor worm added in or a rootkit because everything I've done on this system takes seconds or less!
Like a window to open up is less than the blink of an eye!
I installed the 64bit version because my system is full compatible for 64bit & I've never used a x64 system before.
I must say that it's been a very pleasurable experience so far...
There's only been a few programs I had problems with & they were my fault because I forgot to install the 64bit version....LOL
Once I did that it's been Zooooooooooooooooooooooooom ever since!!!