[samfriedman]

We had a similar system. The problem wasn't in the classes filling up (though that happened too) but that the system was built for steady-state load and not peak load: if you weren't in and out within 10 seconds of registration starting, you were in for minutes of panic as the registration pages failed to load again and again while the classes you wanted were filled by those luckier than you.

Instead I made an autohotkey script to input my chosen course IDs and submit. Just pasting in a value, <TAB>, pasting in a value, <TAB>, etc.

All done in less time than even the savvy registrants who would copy/paste as fast as they could. An earlier iteration used a programmable keyboard macro: AHK wasn't on the lab computers for my first year.