Operating system: Linux-4.18.0-25-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 390.116
Broken: version: 2.81 (sub 12), branch: master, commit date: 2019-09-22 20:38, hash: rB52bdf522afcd
Short description of error
Workbench animation renders are inexplicably slow.
Exact steps for others to reproduce the error
1. Open attached file in blender 2.79 and run OpenGL Render Animation;
Note that the total rendering duration is around 6.32 seconds.
2. Now do the same but opening the file in Blender 2.81 (View -> Viewport Render Animation);
Rendering time is now 22.80 seconds.