Additionally just tested the stanford dragon (100k tris) placed 625 copies to the scene and in 4.15 i get the expected triangle counts, but in 4.17p1 it is twice that many.
The rendering costs is an additional 11.6msec which is huge, considering i opened the same basic scene with just one directional light present.
Collisions and most rendering features were turned off, including shadows and lightings on the model. I’m using the basic worldgrid material here and the scene were built in 4.15.0.
Comparison images from 4.15 and 4.17p1:
