what can i do to regain the speed of my system?

What are some of the things I can do to my MBP to regain its speed? I have a 2.16ghz 2gb MBP that was flying when I first got it a few months ago. Being that I'm in IT I have to try every demo software I can etc.... now it's lagging down my system. What are some of the things I can do? Like cleaning up all the aps, startups items, registries etc....

well, you could re-install osx. But if you don't want to do that, you could try MacJanitor to clean up your old app folders and unused files.

you could try iDefrag to defrag your hard drive. There are debates though whether or not it will actually help. I think it will if you install a lot of programs, and remove them often.

thats about all i have, sorry i couldn't be of more help.

Use something like Applejack or Onyx to clear caches and check files.
Defragging your drive is not really necessary but some people have differing opinions.
Use DiskUtility to repair permissions - not necessary but can't hurt.

I have the same problem and plan on cleaing out my hard drive and reinstalling osx. I think I'm going to wait until next month when Leopard comes out so I can put it on a clean system.

Here is my usual "recipe" for speeding up a Mac that is starting to slow down:

First, check that your processor is running full speed. Go to Preferences, Energy Saver, Options and look at the drop box down near the bottom called Processor Performance. If it is not set to "Highest", set it to that right away. This maximizes performance, but for notebooks, it may run down the battery faster. Note that not all Macs have this setting - laptops do, and my certainly my PowerMac G5 tower does, but not all Macs do.

Next, download OnyX and run the complete set of clean up and maintenance scripts and then evaluate again. Get OnyX at:

http://www.titanium.free.fr/pgs/english.html

Next, you may wish to check that you have enough free space on your hard drive. Highlight the Macintosh HD icon on your desktop, CTL-click it and select Get Info from the resulting menu. Make sure you have a reasonable amount of space left. If not, a little spring cleaning may be in order.

There are two excellent apps for showing where all of your hard disk space has gone, Disk Inventory X and WhatSize. Get them at:

Disk Inventory X: http://www.derlien.com

WhatSize: http://www.id-design.com/software/whatsize

Both do a great job at letting you zero in on your largest disk space consumers, so that you can hunt down any rogue files (and both are freeware, which is good).

Finally, it is possible you may have some processes running that are consuming a lot of idle CPU, thus slowing down your machine overall. I had a bad widget that did this once. Open Activity Monitor and look at your "resting" CPU occupancy when you are not doing anything in particular with the machine. It should be pretty much zero (maybe 1% to 2% at most). If it not, identify the process or processes that are taking the time. What are they? Do you recognize them? Are they needed?

If you find one that is not needed, kill it and see how your machine starts to behave. If this is the cure, you will need to identify the startup item that launches it and delete it.

So, in summary then, take the following steps in order:
1/ Start with ensuring that your processor speed setting is full (applies to many Macs but not all)
2/ Then do Onyx based full maintenance
3/ Then check that you have sufficient available disk space
4/ Finally, search for processes that are consuming an unexpected amount of CPU

I use applejack to keep my system running nicely and am wondering if Applejack will still work with Leopard when it comes out.