On my Vista machine I never noticed any lag with the UAC lightbox, but on Windows 7 the desktop disappears, then there is a definite delay of about a second of black screen before it pops up - just enough to make you worry!
Is this typical and if not, is there anything I can do to speed it up?
The box is a Dell Vostro with Core 2 Duo E7500 (2.93GHz) & 3GB RAM running Windows 7 Professional. It only has X4500HD integrated graphics, but I can't imagine this is a limiting factor on its own.
Answer
Is this when you deal with larger installer files? UAC scans the files for security directives embedded inside, for larger files this will take longer.
If the darkening of the desktop is bugging you, you can turn UAC down 1 level from the default, which turns off the "Secure Desktop" feature. Your desktop won't dim but UAC will still prompt you as before. The UAC prompting will feel snappier too. The dimming may be a little slow on the integrated graphics, making the whole UAC process feel slow.
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