Apache makes Mac Mini lag

Hey guys,
I was suffering from weird lag on my week-old Mac Mini, which I'm writing this message on. After days of researching turned out that Apache was causing it. No specific app takes a lot of CPU at the time the lag appears, nor is the full RAM used. I'm talking about app-wide lag: the whole system lags, a lot.
I simply found it out by closing everything, and one by one starting the different apps. The lag started immediatly after launching Apache via MAMP and stopped right when I stopped it. Same with XAMPP and without using any GUI (the pre-built Apache).
Any idea how I could fix this by myself? I am *not* looking forward to sending the machine to be fixed, as it is my primary work machine. I guess the Apache should be re-installed, but I'm completely new to compiling stuff on Mac.
I need Apache so I can develop on localhost. I'm a developer just moved to OSX from Windows.
Any help is appreciated! I'm willing to give complementary details, but I need directions to get them.
Martti Laine

This is probably just a software problem.
Start with the basics: verify the disk and repair permissions (using Disk Utility).
OS X has a version of Apache built-in. You can activate it by turning on Web Sharing in System Preferences. Try this and see if it lags. You can activate PHP with a few simple Terminal commands. This may be all you need.
If you need mySQL and more control over your environment, then MAMP is a better solution (I've never used XAMPP so I can't compare the 2). Try reinstalling it and repairing permissions again.
You can also use Activity Monitor to see what processes are hogging resources, and Console to see any other problems. I wouldn't be surprised to see some timeouts. If this doesn't fix your problem, check the MAMP forum with the data you've acquired.
I use MAMP on a Mac Pro with no noticeable lags.

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