Sluggish Performanc​e & Audio Problems in Lenovo T520

I have experienced strange problems with my Lenovo T520 (specifications: i7, 6GB RAM, I can post detailed configuration). The problems are:
The audio quality is noisy. What I find strange is the audio quality for the same song worsens when play in VLC media player (more noise) v/s when played in Windows Media Player
The performance is sluggish and the system freezes when moved. What I mean is if I am watching a movie and lift the laptop from one place to another. The movie freezes while moving & audio stops. Once stable again the video and audio synch up again
Trackpad unresponsive: The trackpad get unresponsive at times, but the Trackpoint is working fine.
Could you post a solution to any of the problems?

For the sluggishness....
(1)  Make sure the power cord is plugged in.  I know...sounds dumb, but I had the same problem with my new T520 and I saw a thread on here stating that Lenovo thought it would be a great idea to make your new T-Series laptop run slow when on battery.
(2)  Closely inspect the "Power Manager" profile you're using.  I noticed that even the "Maximum Performance" (or whatever it's called) profile was set to NOT best use the CPU.  In Power Manager, click "Advanced" at the top to go from "Basic mode" to "Advanced mode", then click the profile you want to use from the vertical list on the far left.  Then on the right side, expand the first drop-down category called "Performance" or something like that.  Now there will be two columns under that category...battery on the left and AC power on the right.  On the AC power column set the drop-down box to the "Maximum Turbo" setting.
T520 / i7-2630QM / Optimus HD+ / Crucial M4 SSD

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