I made some more tests but on my Prometheus/Voodoo3/CSPPC060/233 to get more speed results.
Shapeshifter 3.10, 640x480. Tried drivers and modes:
Amiga 16bit window 0.475
Picasso (for old PicassoII) 8bit 0.534
Winner EVD (good for ECS) 8bit 0.606
P96 8bit 2.426
15bit on PicassoIV 2.314 (no 15bit on Voodoo)
CardTrick EVD 8bit (direct) 2.443
16bit (MMU+Delta) 1.074 (allows Voodoo to work)