avanishkumar ,
Sorry that you are seeing this issue with MyEclipse.
Can you answer some more questions for us ?
1) Have you tried a fresh workspace ? If you could start with a new workspace then replicate the problem with the minimum set of projects and editors and actions, that would be a big help.
2) Do you see any errors of interest in the .log file which is located at <workspace dir>/.metadata/.log ? If yes the paste them here for us.
3) Take a look at this performance FAQ : https://www.genuitec.com/forums/topic/troubleshooting-memory-amp-performance-issues/
You can try increasing the heap and look at the second section for how you can change the JS settings to improve performance. I suggest you move to the Basic mode.
4) Please go through this link which discusses similar issue and check if any of the suggestions help fix your issue : https://www.genuitec.com/forums/topic/myeclipse-10-very-slow/
Let us know how it works for you.