Haha oh boy. Kliking on a period Win98 PC certainly brings back some good memories and old frustrations. Hand in hand. Back in storage you go.
Use the password speedtest to run a simple benchmark. My vintage box can handle about 80 Yellow Joggers before it starts slowing down.
(The vintage box in question is an OptiPlex GX1 tower with a PIII CPU @ 450MHz and 512MB RAM.)
Edit: Uploaded a v1.1 with a cleaned up instructions page and a Win9x-style sample playback lag toggle ('w' key ingame). The lag mode has a bug where some shots seem to get stuck in the upper-left corner, but it more or less gets the point across.
Double edit: Hmm... MMF2 and Fusion 2.5 do not like some of the events in this game, particularly the rotation of the disco guy.