recording screen: always slow

when i record screen with any screen recorder (camtasia,camstudio) it records slow choppy , especially when i drag windows they move at 5 fps , it flickers. all in all is too slow. I have the same issue on 3 different computers . one with p4 , one with core 2 duo 2.8 ghz with 9600 gt 4 gb ram, and on a q9500 ati 4770 4 gb ram. the same results. I believe it's windows 7 , coz this is impossible. the same thing happened with windows vista, but they record fast in windows xp , even on my p4 machine . all computers record the same on windows 7. Do not tell me to adjust the setting coz i will laugh at you. I been douing that for 3 years. camtasia forums and support are not helpful. their products sucks. Do you know what is wrong with w7? or can you recommend a different program (free or trial)?


thanks for reading.

much better thanks. But i wish i could have aero and fast recording since i've seen on youtube , so it can be done....

Usually I use the program Screen VidShot, nice tool and really simple.