Here are the big ones:
Brazil
Final Render
Mental Ray
Vray
Which one of these are the fastest/best at doing displacement maps?
If your talking about micro-poly/triangle/pixel displacement, then I’d wager that most would agree on Vray as being the “fastest/best” when it comes to rendering displacement maps, finalRender Stage-1 probably being a close second. None of them are perfect yet though, but with time will likely improve. Vray 1.5 is supposed to be coming out this week (hopefully) and the displacement has been overhauled I hear. If your just doing basic displacment in Max though then any of them should do a good job.