Hey Epic Staff,
Upgrading from 4.13.2 to 4.14.3, we’ve noticed some extra cost on the GPU time, specifically Begin Occlusion Tests.
We’ve benchmarked extensively with same camera angle and scene and these results are consistent - our scene time in 4.13.2 is around 5.27, and our scene time in 4.14.3 is 5.77. This extra cost is significant for a VR project.
The largest change seems to be in BeginOcclusionTests, which is around 0.70 - 0.85 in 4.14.3 and around 0.50 - 0.57 in 4.13.2 As a side question, is there any reason that there are two BeginOcclusionTests entries for VR, even when stereo instancing is enabled?
Pleased see attached two pics of our 4.13.2 and 4.14.3 GPU profiles! We’d appreciate advice on how to get our cost back down, and what might be causing the problem between these two engine versions.
