I just found out that there are settings for the display refresh rate. It was set to 50i Hz, I switched to 60p Hz and it seems to be a bit better. But no cigar still...
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My recommendations would be, install all windows updates and install the latest graphics drivers.
Also, I performed a research and found 2 websites with interesting troubleshooting, here I add them:
NOTE: This link is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.
Hope this can be of help and I'd much appreciate if you let us know how it went.
I have update all drivers etc. It didn't really help.
But I already found the cause - it's just the TV's HDMI input lag. It's a Panasonic Viera which are known for having quite high input lags (65ms etc).
This is causing the difference between the mouse movement itself and the cursor movement on the screen.
I have tried it on a standard (or rather gaming grade) PC monitor and there was no lag at all, no matter what mouse/keyboard I used.