#Repro
- Make a large level with a very large nav mesh
- project settings-> nav mesh → rebuild at runtime
Reload editor, and make sure the “building navigation” message lasts at least 10 seconds
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construct a reasonably complex scene that takes fps below max on your machine
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do this in 4.3 and in 4.5
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observe difference in FPS while nav mesh is rebuilding itself in 4.3 vs 4.5
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create some actors during runtime via key press, in 4.3 and 4.5, that have CanEverAffectNavigation set to true
Result = endless loss of FPS in 4.5 as long as you keep triggering navigation mesh to rebuild
So what this means for me is
#I have to revert to 4.3 until this issue is fixed
I can’t test actual fps drop of other game mechanics until this issue is fixed, and so I must revert to 4.3, because AI is stage of development I am most focused on right now.