Wednesday we made a test with 1.5dev (2005012800) using the Workshop module and chat over 4 hours with 15 students.
After 15 minutes we killed the chat with 10 peoples (chath method standard, refresh time 5 seconds). No reaction. Very slow reaction on all sites . (Hosted Server 2,4 Ghz processor, 3,5 Gb Ram).
The workshop went on with a good reaction times after disabling all modules in the administration we didn't need for the test.
We checked now the log files. In four hours we used 40.000 files and 280 MB traffic. We didn't use any uploaded files for the workshop and only edited texts from the users.
I don't know what other user made on this server at the same time. What is your experience with this modules and the server capacities?