Unreal Engine 5.7 and Cesium "Maximum Cached Bytes"

Cesium for Unreal
1

Hello.

I ahve an issue using Cesium inside Unreal engine.
I suspect Cesium World Terrain with Cesium OSM Buildings cause my project have performance spikes (laggs in certain areas). I am not sure but i am testing it. To optimise my project what i want to test for pixel streaming.
Currewntly inside my unreal engine 5.7

Chat GP recomends me this and wanted to test it out. And tried to change Maximum Chached Bytes inside Cesium plugin in Unreal engine. But number automatically reverts back to 268435456

How to change that?

Things that often trigger the VRAM warning in Cesium projects

:one: Tiles loading too quickly

Limit loading bursts.

In your Cesium3DTileset actor:

Maximum Simultaneous Tile Loads = 10

Sometimes the default is 20–50, which causes spikes.

:two: Cache too small

Increase:

Maximum Cached Bytes

Try:

4000000000  (4 GB)

or even 6 GB if you have RAM available.

:three: Camera moving too fast

Fast camera movement in Cesium scenes loads many terrain + building tiles simultaneously.

This can temporarily explode memory requests.

2

Hello @ISUther,

But number automatically reverts back to 268435456

That’s rather strange. I’m not encountering that on my end with UE 5.7.3, c4u 5.7.0

When does the value reset? Any other behaviors you can share that might be causing this?