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Recently my Mac mini became quite slow without a real apparent cause. I'd really like to be able to trace down the cause of this slowness, and I'd like to do it myself, not using a program.

Is there a good Mac OS X resource website that could lead me to that?

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Is it slow to start up or in normal operation? In the second case, create a fresh user and log in using that user and see if it's still slow. – lhf Sep 9 '12 at 23:53
no it's only slow at startup but thing is I would like to be able to trace the cause by monitoring each startup process, like a system profiler or a small script that I would code myself – titiyoyo Sep 10 '12 at 7:45

Couple things to try:

You'll see a narration of the start up processes.

  • Open Console and look at your logs.

There's lots of things that can lead to slow startups, but I'd be on the look out for permission and network timeout errors.

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+1 for the word "narration" in this context – myhd Sep 14 '12 at 21:23

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