I have had 20 students connect and take tests, participate in forums, and upload files for me to grade. All this without any problems or performance slow downs. I hope to move it over to a dedicated server soon for some real world testing. I usually have 60 students in a class, so I need to test it with 60 students simultaneously connecting.
For any teacher, having quizzes and test grades added to your grade book automatically is a blessing. I have a total of 300 students that I have to grade and this makes my life easier. If you looking for something like this, please check it out. Oh! I forgot to mention, this is is open source and it is all FREE as in free beer. It will run on any OS as long as PHP is supported.

