with the replicator clones max speed is 65mm/s for pla and around 20-30 for polyflex - flexible pla.
Neither of them will touch ninjaflex or filaflex.

So far on the he3d k200 delta. I've gone up to 100 for pla - at 0.3mm layer height - so a fair volume of plastic going through the nozzle, 50 for polyflex and 20 for ninjaflex and filaflex.
Petg - I think - I printed at either 50 or 60 with 0.1 and 0.2mm layer heights.
Pretty sure she'll go up to 150 for the right high speed pla.