x264 in Vista

[twolfe18]

I was reading around about Vista, because I am very dubious. Just about every article I have read had indicated that Vista is slower than XP for media encoding (accross the board, Xvid, DivX, and h264). for example: http://www.tomshardware.com/2007/01/29/xp-vs-vista/page5.html

Now, I am specifically interested in x264 because that is what I use. Looking at the link, it says that mainconcept's implementation of h264 goes about 24% slower, and I assume that x264 will take a similar hit. why is this?

Is it specifically an OS issue, or does x264 just need to be refined for vista is later releases? And if x264 can be refined, have any of the recent releases addressed this? How do the encode times for x264 compare right now (for xp and vista), and will they get to just about equal?

thanks in advance for your responses. :thanks:

[Adub]

alot of it has to do with vista's overhead, plus with the fancy shmancy interface, that takes up critical CPU cycles and god knows what else.

[lcx]

I haven't noticed any time difference between XP and Vista with x264 encodes.
I don't use builds posted here. I compile everything on my own using Visual Studio with my own additions for 64-bit encodes.
In addition, my encodes run at highest quality settings with process priority set to low because its my development machine, gaming pc & I record tv using media center.