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Hi Dennis, you are most likely having trouble with not enough processor or ram on the server for your user load rather than a bandwidth problem. The quiz takes a good deal of system resources as it generates the entire quiz at the start and then submits it all in the end, both of which put a big peak load on the processing power of the server. If 35 people are starting a quiz with a high number of questions at the same general time, you may need a pretty powerful server to enable that (This is not a problem unique to Moodle, colleagues inform me that Blackboard 6's assessment engine starts to choke at ~20 simultaneous accesses on some pretty powerful hardware).

Limiting the number of questions total will help, but AFAIK, even with the new ability to limit the # of ? displayed per page, the still quiz loads all the questions from the db at the start time (Henrik or someone correct me if I'm wrong here).

If you can't get a more powerful server, you might try using lesson rather than quiz, as lesson does database reads/writes one ? at a time rather than all at once so the peak load on the system remains much lower. What this means is that alot more people can start a lesson at the same time without overloading the server.

Lesson in 1.5 supports clustering, which allows fine control over randomization, but it is not as easy to set up as quiz (by a long shot, we're hoping sometime in 2005 to find time or funding to make lesson work directly with quiz question categories if it can be done while preserving the incremental read/write feature).

Dennis, if you have huge quizzes, you can now break them up into pages when being displayed.  Look in the settings for each quiz for the number of questions per page.