My Razr is slowing down. Need advice! topic

Lately, my Razr seems to have become quite sluggish, its been performing very slowly, long response times, lots of lag etc. etc. i shifted between ROMs and still the problem persists. I use CleanMaster to keep my RAM clean, but the RAM memory just seems to be getting used up completely. It was fine till about 5-6 months back.

I have stock kernel and Slim ROM 4.3. What suggestions can you give?? Should changing to Dtrail1's kernel help?