After I installed Lion Mountain my Macbook pro is slow and most of the applications fail to work. Is there is any update coming soon? Or should I uninstall lion mountain.

I would reinstall it first and see if that helps.

A clean install.

There is likely an update in the works, but it won't fix your problems.

Why do you think that is normal behavior? Why would they release it if that was normal?

There can be various things that are causing it.

First, try logging into another account. I don't think that will have any effect, but it is easiest.

Next, Boot into Safe Mode by holding down the Shift key on restart (at the Tone)

If it works ok, we have to figure out what you have installed that is causing the problems. This may or may not identify a third-party conflict, but it is likely to.

If it still doesn't work, boot into the Recovery HD (cmd-r on restart) and open Disk utility. Repair the Disk. You can Repair permissions, also.

If all of that fails to change anything, I would reinstall Mountain Lion.

Still no good, make sure your backup is good and erase and install. You can do this by booting into the Recovery HD, erase the drive with Disk Utility, then install Mountain Lion from there.

I second Barney on that. Before any major operations, you should consider updating third-party software (or even uninstall some). Follow the guidelines above.

One common problem seems to correlate with non-Apple extensions, possibly loaded long ago and migrated from an older Mac OS X.

Linc Davis suggests this as a way to find those non-Apple extensions:

Please copy or drag -- *don't type* -- the following command into a Terminal window, press Return, and post the output (if any):

kextstat -kl | awk ' !/apple/ { print $6 } '

I would first ask what Mac OS did you upgrade from?

If you moved from 10.6.x Snow Leopard to 10.8 Mountain Lion, then it is to be expected that many apps that worked just fine in Snow Leopard, particularly third-party apps, will not work under Lion or Mountain Lion because they contain legacy (old) code. If you select one of your troublesome applications, then from the menu click File > Get Info and the app is identified as Kind = Application (PowerPC), then that is the problem. The application will be incompatible with Lion and Mt. Lion and should be updated, if possible.

If you have upgraded from OS X 10.7.x Lion to 10.8 Mt. Lion and now your otherwise fine apps are misbehaving, then the problem is perhaps a corrupt upgrade or applications in need of updating, and I would heed the advice of the others here who have suggested various remedies.

Good luck.

I just had the same sluggish problem on my 2.4 ghz macbook proafter installing mountain lion. It took 15 seconds to just open up system preferences. So after much research I saw a post that showed how to disable DashBoard via the terminal window. For me disabling dashboard was a no brainer because I never use it anyway. After disabling dashboard opening system preferences took less than .5 seconds and other applications like Pages start way faster too. The article below also shows how to re-enable dashboard too so don't be afraid to try it. I tested it on my IMac too and wow what a difference in speed.

http://www.macgasm.net/2012/07/09/disable-dashboard-lion-osx/