slow startup after security update?

[synchronicityii]

has anyone else noticed a considerably slower startup after installing the latest security update from apple? i've noticed that both my macbook and imac take an additional 10-20 seconds on the grey screen before they boot up

[fryke]

But just the first time right after installation, right? That'd be normal behaviour in recent years. System updates and security updates make OS X boot slower right after installation. Subsequent restarts are quick as ever.

[synchronicityii]

no, not just the first time. i know that it will usually take a while to boot up after the first restart after the initial installation. the subsequent restarts don't take nearly as long, but they are noticeably longer.

[Tommo]

My Macbook Pro is suffering from the same thing. Can't find a fix for it or work out why it is doing it.

[bobw]

From MacFixIt;

Delete kernel extension caches, other caches for some issues A number of common issues that crop up after incremental Mac OS X updates can be resolved by deleting specific cache files -- specifically kernel extension caches -- and restarting.

This can most easily be accomplished with a shareware utility like Tiger Cache Cleaner, but also bears a manual process which involves dragging the following files to the trash:

com.apple.kernelcaches (a folder in /System/Library/Caches)
Extensions.kextcache (a file in /System/Library)
Extensions.mkext (a file in /System/Library/)
com.apple.ATS (a folder in /Library/Caches/)
Files that start with com.apple.LaunchServices (in /Library/Caches)
You will be prompted to enter your administrator password when dragging these files to the trash. You may need to restart after moving them to the trash.