Description

Major performance drop with instanced meshes since PhysX 3.4 upgrade

Regression: YES
Worked: 3172292 (4.13.2)
Broken: 3249277 (4.14.3)

For me, my results were:

4.8 through 4.13
No Collision - 340 fps
Collision Only - 260 fps
Physics+Collision - 80 fps

4.14 and 4.15
No Collision - 280 fps
Collision Only - 100 fps
Physics+Collision - 32 fps

Steps to Reproduce
  1. Open attached project in 4.13 and enable "Show Frame Rate and Memory" in Editor Preferences>General>Misc
  2. Bring up the console and enter "t.maxfps 500"
  3. Open the map from the content browser
  4. Select the only blueprint in the level
  5. Set Mode to 0 (No Collision)
  6. PIE and note Frame Rate
  7. Repeat with Mode 1 (Collision Only) and 2 (Physics+Collision)
  8. Upgrade project to 4.14 or 4.15 and repeat

Result: Severe drops in performance from 4.13 to 4.14
Expected: Maybe some performance difference because of PhysX 3.4, but nothing this significant (see description)

Have Comments or More Details?

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Fixed
ComponentUE - Simulation - Physics
Affects Versions4.14.34.15
Target Fix4.16
Fix Commit3368072
Main Commit3385232
CreatedMar 15, 2017
ResolvedMar 28, 2017
UpdatedMar 29, 2018
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