ok so i got a acer aspire one netbook with atom prosseser and kde 4.3 installed over ubuntu, so i want to know if there is anything els besides turning off the effects and useing xrender insted of opengl for better performance, its not that bad but if i were to move a plasma window fast it will lag, a little bit ago befor i did a fresh install when i switched to xrender my computer was pretty fast but now its not with the same settings, so please anyone out there can you give me some tips

Qt 4.6 includes many performance enhancements for the underlying systems that power Plasma, so it will likely fix that. KDE 4.4 is going to depend on Qt 4.6 I believe.

Are there any other locations other than Plasma where you experience lagging?

You could try to run plasma with raster graphics system. http://chakra-project.org/bbs/viewtopic.php?pid=7605