Suddenly Macbook has become slow

[senthil03]

Till a few days back, my macbook was perfect. Suddenly it has become extremely slow and the applications takes ages to load. When I see the activity monitor, it shows application not responding but a few minutes later it is back to reasonable speed. When ever I try to launch a new application it really slows down.

Can anyone suggest what has to be done to get back my macbook to it's old speed.

[fangpyre]

Is this for all applications?
Do you have any open applications when this happens?
You might want to open a new user account and test things from there.

[michl]

Here's a good start:
17 Reasons Why Your Mac Runs Slower Than it Should.
A nearly full hard disk probably tops up the chart...