Map performance degrades severely over time
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SnowOrShine
Open VRChat and load a reasonably complex world
Example: An old Neon Divide map that hasn't been updated in 2 years (This also occurs with more modern maps, but this map's performance is so bad it's a useful test case)
Stand somewhere in the map, and watch performance degrade sharply over a few minutes
This seems to be a CPU issue, CPU usage increases over time
On some hardware configurations, performance may jump back up again and then start degrading. Something to do with threads getting overloaded and new ones being spun up
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hdorriker
I recently saw this happen on a very fast time scale (minutes) on a newer world using persistence and in this case, it was caused by log entries for an exception being logged every frame. This could happen in any kind of world new or old with or without persistence if there is anything (ANYTHING) which creates a log entry every frame, and for worlds which haven't been updated in a while, if there is some sort of client change which could cause a previously quiet error to now cause a log entry to be made every frame, there you go. This may or may not be the exact cause of this specific issue, but it is one of possibly many ways for a similar issue to happen.
StormRel
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SnowOrShine
StormRel Update for you: Having re-uploaded both of these maps, neither shows the issue, but the version still above live still does
We're going to leave the one previously linked above as-is, if you'd like to use it to get to the bottom of this issue, in case it re-occurs in future uploaded maps
StormRel
needs more information
Is this issue still occurring? Is it only on PC? I don't seem to have this issue on the world you provided.
SnowOrShine
StormRel
Hardware stats in description of this video taken just now showing the issue:
(Observe performance halving over the course of 60 seconds after rejoining the world)
Further context/details:
- We have 2 maps we see this happening on
- This issue was happening in neither map about ~2 months back
- At some point in the past ~2 months this performance issue started happening on both maps
- One of the maps (The one linked in the post) has not been touched in over 3 years, so it really can't be anything we did
Could be to do with mipmap streaming or anything new added to VRC in the past while? We've seen this on 3 separate PC machines, in both Desktop and in VR, and they all have different combos of CPU and GPU architecture
Would be willing to retest on older VRC builds if we can get access
StormRel
SnowOrShine: I've followed your repro and attempted to mimic the video you provided, but I can't get any performance degradation. Can you provide a dxdiag dump?
SnowOrShine
StormRel Here ya go �
StormRel
SnowOrShine: Thank you!
StormRel
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