N64 and arcade games mostly, is Gauntless legends one of the more demaning games ?
I can answer that, in a limited way.
I'm a collector of 3dfx Interactive hardware so to some degree have wandered into Arcade related items powered by 3dfx hardware.
Games like Gauntlet Legends, WAR, Road Burners, Blitz, Mace the Dark Age, Rush and several others are 3D polygon based games that were powered by 3dfx hardware running 3dfx's glide API.
Emulators typically run these games utilizing only the 2D core of your graphics card and main CPU and even though modern graphics have come a long way its still not very good compared to running on native 3dfx hardware.
Hope this has been some minor help.
I have been tinkering around with running these titles with MAME and have come to the conclusion that I'm going to keep an arcade cabinet around so I can continue to enjoy them as they were intended. I just can't get a decent frame rate or image quality going with a burly PC running a fairly new stout graphics card even in multi processor mode.
Gary