Take a while to start up and shut down

My MBP has been taking long to start up and shut down recently. I haven't put in any new softwares, been running regular updates. I tried fixing it with "Snow Leopard Cache Cleaner" and "Blackhole", but wouldn't speed up. Sometimes, applications shut down randomly. Please help.

There is an issue I have noticed and I have been able to solve it for a good few people now, relating to slow boots and shutdowns.
It is particularly obvious when on shutdown you see the spinner circle for a while.
I had this issue myself and I fixed it using a simple terminal command.
There are permissions on all the files on OS X, and there is a bug I believe when you do certain operations that screws up the group permissions on root (or / as it's known).
An example of an operation that messes it up that I've come across is 'Deleting free space using disk utility' but I believe using certain apps such as ONYX can have this effect too.
Basically the problem arises when OS X cannot create caches it needs to.
You can tell if you need to run this command by looking at your console messages and if you see something like:
'Kext can't create cache - owner not root' then you have the problem.
The most interesting thing (as of 10.6.5 don't know if it's fixed in 10.6.6) is that 'Repairing Permissions' doesn't fix this issue EVEN THOUGH it is a permissions issue.
The solution is simply to run this command:
Open Terminal and run:
sudo chown root:admin /
even if you don't have the issue running it will not cause a problem so you can try it without worrying.
Of course there could be something else that's causing your issue, but as niche as this issue may sound, nearly every person with a Mac that's experiencing slow boots & startups has had the issue fixed by this.
Regards,
John
I have submitted a bug report regarding this FWIW.

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