I'm hoping someone might be able to comment on why Left4Dead2 runs smoothly on Windows XP Pro (32 bit) as compared to Windows 7 Ultimate (64 bit). Under Win7 the game is often pausing/jerking, it seems to coincide with when a sound is played. Frame rate between these intermittent 'pauses' is perfectly smooth.
The game ran smoothly on XP with only 2GB RAM, but in attempt to fix Win7 I have increased the RAM to 6GB but it made only a slight difference (if any).
I did once have similar performance issues in XP with a certain version of Avast virus protection. Disabling the 'real time sheilds' solved the problem. At the moment I am using Microsoft's Windows Defender, disbling the real time protection makes no difference, and I had the same problem with no virus protection installed at all.
Google searches have so far been fruitless.
Do I just need even more RAM, is there some file checking process in Win7 that can be turned off, or is it something else altogether?
As I have mentioned, the frame rate is fine, it just keeps 'pausing' for a fraction of a second.
This game is the only reason I still have WinXP installed on my PC.