On an old toshiba I had, the power supply wasn't strong enough to power the battery and the notebook at full clockspeeds at the same time. I found that glitches and minor freezes stopped when I lowered my power scheme to max battery while the battery was charging. It's a long-shot, but see if that works.
On that laptop, the power supply was too weak to carry the full load of the system at maximum clockspeeds and charge the battery at the same time. This resulted in the unit freezing for a few seconds every so often. Performance was dismal, and I was frustrated. I noticed that this never happened when on battery power, or when I was plugged in and my power profile was set at "max battery". When my battery was charged, however, running the machine at full clockspeed was no problem. I'm saying that, albeit a very unusual situation, and not likely to be your problem, it's possible it could be. Does the same problem still occur if you change your power profile to "max battery"?
There appears to be some improvement and if anything there has been slight hesitation as opposed to freeze up in the cursor action.
Tomorrow morning will be the test when I do my PTC surfing.........I surf approx 35 websites and then I update my spreadsheet records of my earnings and stats. This will be a good test and would add that my laptop has been on for most of today and so far I have noticed an improvement.