Video Acceleration For Mac

So I bought this 600mhz iMac G3 for a friend. It has a CD-RW, but not a DVD drive, so I installed Tiger by putting the iMac into Firewire Target Disk Mode and installing Tiger via my PowerBook G4.

It works and boots, but somehow I get the feeling that there is something wrong with video acceleration. I mean, even though its an iMac G3, it has a 16mb Rage 128 Ultra AGP. It should be able to play 320 x 240 Sorenson movies full screen just fine. It also should do iTunes visualizers with 'faster but rougher display' enabled just fine (remember those iTunes visualizer commercials from when the iMac G3 was still current?). For some reason, none of this stuff seems accelerated as it should be (in my opinion).

Video Acceleration Mac

Hardware Acceleration Macbook Air

Is there a way to check if the correct video card is recognized and drivers installed for Tiger? After all, I did install this OS from a G4 with a totally different video card from a different manufacturer. Could this cause video problems?.points to sig. Advanced file manager for mac. I can assure you that my iMac cannot run iTunes visualiser at full speed in OSX.