Analysis of information sources in references of the Wikipedia article "MilkDrop" in English language version.
GEISS is entirely copyright (c) 1998–2000 by Ryan M. Geiss [...] Geiss uses hand-tuned x86 assembly language to reach blazing speeds, generating smooth and graceful realtime graphics... and it can hear whatever your computer hears and synchronize the graphics it generates to the sound you're hearing.
Also, a 3d-accelerated video card will make NO difference.. What you see in Geiss right now is not hardware accelerated (nor can it be).