Projector performance ?

Hello; My character moves on a "terrain" and leave footprints on the ground. I use 9 "prefab_projector" from a array with a texture "256px". Unfortunately performance has lowered : 200 fps without and 80 fps with "Projector". Another more efficient solution? thank you

my function "footprint.Update()" takes 0.0% cpu in the window "Profiler" !

Without some actual code to look at, we can't really say much.

But I would look at using something similar to the skid marks from the Unity car demo, which uses instantiation and a timer to destroy the objects after a set time. Projectors are a wonderful thing - in moderation.