Mountain Lion OS a failure upgrade????

I have recently updated my macbook pro to mountain lion..after the update
1)my battery drains fast
2)Safari freezes quite often.
3)At times even a normal page takes a long time to load with a good net connection.
Any1 facing similar problems? I am really blaming myself for doing the upgrade for $20. Since my mac use to work much better than how it is now....Is there any specific settings to be changed or ?? I dont know., I am not a techie or somethign..just use my laptop for normal purpose....
My macbook pro is 2.3 GHz Intel Core i5 with 4gb ram and contains 10.8.3. It will be of great help if someone shed some light and help me...
Thank you.

From the Safari menu bar, select
Safari ▹ Preferences ▹ Extensions
Turn all extensions OFF and test. If the problem is resolved, turn extensions back ON and then disable them one or a few at a time until you find the culprit.
If you wish, you may be able to salvage the malfunctioning extension by uninstalling and reinstalling it. That will revert its settings to the defaults.

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