Operating system: Darwin-18.7.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 560X OpenGL Engine ATI Technologies Inc. 4.1 ATI-2.11.20
Broken: version: 2.82 (sub 1), branch: master, commit date: 2019-11-04 20:01, hash: rBef7fd50f8a93
Short description of error
The EEVEE background render times at (250ms) create a sluggish viewport. I strippeed away as much as possible, so deleting a material / modifier or hiding an element will restore the background render times to less then 10ms. Also moving a mesh (Part1 or Part2) out of the "Eyes" collection the viewport speed is ok again. But very oddly the order of adding any of these meshes back to the "Eyes collection" - so first Part1, then Part2 vs. first Part2, then Part1) makes the viewport behave correctly or very sluggish.
Exact steps for others to reproduce the error
- open the file
- rotate in the viewport