Basically, I was struggling with my webcam that was freezing after a while. I finally found the perfect configuration to mix the desktop, the webcam and the banner so the recording can be smooth even on an old laptop like mine.
I usually capture at 10fps, to leave some CPU power for other apps, but I did some tests at 15fps and it was still running great.
Seems that using a local file in FLV or AVI format, does provide a great encoding performance. Increase the bitrate for maximum quality.
If your computer is powerful, cranck the capture rate at 30fps.
Have a look at my latest screencast and see how it has improved.
I am already working on the 0.9 version where I did some improvement like displaying the real name of the audio and webcam sources instead of showing the file device. Another fix was added when you did not select a custom banner which was preventing saving the last settings. ScreenStudio 0.9 will be released in the next few days.
Until then, have fun!