I used trim before - didn't help.
By default my Note uses pegasusq governor with speeds from 25MHz to 1.7Ghz (so I suppose I have non-stardard kernel, I don't remember what I installed though).
When I switch to interactive governor it works MUCH better, but I also rise the minimum 25MHz to something higher (currently I have 225MHz as minimum) - it looks as if it sometimes can't wake completely from a very low CPU setting and gets stuck on low setting (lagging like hell)...
Or maybe my kernel is buggy - I should clean the whole tablet and start over with new ROM and a standard kernel or something... I just have too many things there to even attempt that right now and too little time.
Thanks for your help, anyway.