Huge Memory Fluctuation Issue

Questions
1

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I just noticed my memory consumption fluctuates to a double amount while the scene is static, no new mesh or object created since my app is a simple viewer. I understand small fluctuation is totally normal, but this amount, 600MB to 1400MB is kinda surprising me and feel wrong. The memory will always drop to 600MB and the heap snapshot is always around 450MB, so no memory leak i believe. Anyone any idea how to debug further this issue?

The memory usage is from

const perf: any = performance;

if (perf.memory) {

  const usedMB = (perf.memory.usedJSHeapSize / 1024 / 1024).toFixed(1);

  const totalMB = (perf.memory.jsHeapSizeLimit / 1024 / 1024).toFixed(0);

  text += \`Memory: ${usedMB}MB/${totalMB}MB\`;

}

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2

This is GC so your scene seems to overallocate per frame on the JS side.

A repro would be useful to better understand the issue.

3

Yea the GC is weird for me. Most of the time it fluctuates a lot. Occasionally it is quite stable, not exceeding 100MB variation for a long time. I will try to reproduce it in the playground.

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