Lag when system sounds play on Retina MacBook Pro

I have a problem on my Retina Macbook Pro (Mid 2012, running on 10.9 Mavericks) that has persisted for quite some time.
Essentially the problem is that whenever an application plays a system sound, the application lags for a few seconds. However, this comes and goes.
For an example of what I mean, the lag happens when I make the following actions:
- Deleting a file in Finder (Trash sound should play)
- Using a 'find' prompt in an app like Chrome, Xcode, TextEdit, and entering a string that cannot be found. That is, the lag occurs when I type the character that causes no result to be found. (Beep should play)
- Pressing 'delete' (backspace) in any app's text field with no text present (Beep should play)
- If I go to System Preferences -> Sound, and select a new 'alert sound' in the Sound Effects tab, the lag occurs and the Console prints "System Preferences[52828]: Error 268435460 setting AlertSound"
While my computer is in 'problem' mode, every single app is guaranteed to lag when these events happen.
But as I said, the problem comes and goes. It first happened after I had to reinstall one day. I think I screwed something up with preferences, permissions and such, because it took a while for me to fix everything up. But I don't think I quite fixed everything, because this problem started to occur ever since then.
The problem will appear for days or weeks at a time and then disappear for weeks. Just now I'm posting this thread because it had actually gone away for months, and just reappeared today. Nothing that I have found can explicitly start or stop this problem from occurring, it's seemingly random.
Does anybody have any idea why this would occur, and what can be done to fix it other than a complete clean reinstall?
Thanks!

Sorry wrong post to this thread.
Now the right post.
No OS X can not use all 8GBs of RAM when the Windows Virtual Machine is running. As long as the Win VM is up and running it take all the RAM you allocated to it. So if you allocated 2GBs of RAM to the VM OS X can only use the other 6GBs. As for the CPUs OS X can use all the cores and or Virtual core as all current Intel CPUs show as double the physical number of cores. So if you have a Dual Core i5 it will look like you have 4 cores. It's done with HyperThreading.

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