For some reason, I can't get more than 1 frame a second from Cam Studio. I tried tweaking the settings, but most of them were blocked for some reason. (The number fields were grey and didn't let you click them.) The two sliders that were open didn't fix anything. What's going on?
It could be the hardware or the video drivers. I've made videos with it before with no issues.
Sometimes, the impossible can become possible, if you're awesome!
note - i don't use camstudio, so i can't comment on the lag, however here's how to be able to change the greyed-out settings: uncheck the "auto adjust" option