Cyrix was physically incapable of pipelining FPU instructions. Without Pentium Quake would have had to wait two more years for commodification of CPUs delivering similar floating point performance.
Quake needed March 1994 Pentium 90-100 to deliver ~smooth 25fps. Cyrix released similarly performing 6x86MX PR200 in May 1997, AMD K5-PR166 January 1997. Quake was unfeasible till ~1998 at the earliest to be able to sell playable game.
