Hi,
I've been running into an odd issue while using the multithreading mode "CullThreadPerCameraDrawThreadPerContext". Usually, this threading mode offers the best performance. I can get 20-30 fps in an urban area with all shaders maxed and osm2city enabled. However, sometimes one of the threads appears to "cut out", and performance drops to 10-12 fps. In this screenshot, the times when the cpu utilization drops (one thread goes from 100% to almost 0% cpu) is when the performance hit happens.
This is on Linux using latest git, Nvidia GTX 1060 6gb, xeon 5687. I know the processor is old but it usually does just fine. Any ideas?