EFI Update Fixes XP Performance ... Even with X1900

Before installing Windows XP in my Mac Pro via Boot Camp, I just wanted to make certain that the recent EFI firmware update fixes all the issues, including for Mac Pros with the X1900 video card.
Thanks,
Clark

Making it easier, and better support, and eliminating known issues; but, ALL the issues is a tall order.
Also, it is probably a lot easier to skip the BootCamp partition and just throw another small drive in.
Searching for "X1900 + Boot Camp" by date yields:
EFI Update fixes XP performance even with X1900
Mac Pro 2GHz 2GB WD Raptor/Caviar RE 320 Mac OS X (10.4.7) 2 x APC RS1500s

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Hello,
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'''Note:''' You might want to print these steps or view them in another browser.
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thanks!

Hey Shadowyani, please take a time and fill a bug report at http://developer.apple.com/bugreporter/ . The machine is useless for me as it is now because I develop and use very GPU/CPU demanding scientific applications, after the update my realtime applications are completely useless as they drop from something like 25fps to 9 fps even on Mac OS X (no SMC reset fixed the issue). In bootcamp the situation is worse, my software runs at 4 fps and gaming turns to be impossible to play as well.
Please let Apple know about the problem, fill a bug report, even if SMC reset once in a while fixed the issue for you (this is not a common behaviour and must be fixed). We paid the price for cutting edge technology.
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Hi!
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I found the same problem with new update and already wrote about this problem in this forum.
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Very glad you added that bit of information because I see different problems similar to this. I want to share with them what you did and hopefully you not only fixed your specific problem but you can lend some more advice to others with problems like this. Thanks!
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Mac book pro is very very slow/it hangs for even the smallest tasks/even with the lid closed it is still running if it is not completely turned off. Dose any one know what may be wrong ? and how to fix it?

More details about the problem : My computer is a Mid 2012 Mac Book pro 2.9GHz i7 processor with 8GB RAM updated to OS X v10.8.5
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Thank You

Start with this comprehensive troubleshooting article:
https://discussions.apple.com/docs/DOC-3521
Look at this one for possible solutions:
https://discussions.apple.com/docs/DOC-3353
Ciao.

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This didn't solved my issue, Apps are still using a lot of resources.
I'm attaching a screenshot of xcode using 114% of the processor, no compiling is being done, just editing.
The rMBP has 16GB of RAM, so it's not pagination

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