nobrot:

If I understand the issue correctly, and I may not, there is a different firefly render engine for a 64 bit OS with improved multi-threading which is unavailable on a 32 bit OS.  The 32 bit firefly engine appears to use all four cores (I have watched in the task manager) during processing but I understand the results are much quicker with the 64 bit version.

If you want to see screaming renders, try Carrara.

Klebnor

Lotus 123 ~ S-Render ~ OS/2 WARP ~ IBM 8088 / 4.77 Mhz ~ Hercules Ultima graphics, Hitachi 10 MB HDD, 64K RAM, 12 in diagonal CRT Monitor (16 colors / 60 Hz refresh rate), 240 Watt PS, Dual 1.44 MB Floppies, 2 button mouse input device.  Beige horizontal case.  I don't display my unit.