That's a very interesting report, thank you !
Very helpful too, because identifying the exact version in which a problem appeared makes it easy to find the cause...
The one and only change in v1.30.2.28 that went in textures LOD determination was "Fixed a bug that caused some animated textures to stay blurry", and indeed, this is the culprit for this issue, the problem being that the case when the fix triggers (and indeed solves the blurry animated textures issue) also triggers for many other textures that are not animated (especially avatar attachments textures), causing them to load at way too high a resolution, in turn involving a large memory consumption and violent reloads when the fetcher finally reaches a 5.0 discard bias and returns to anything lower afterwards...
Fixed for next release. Here is the patch to apply to current sources:
But this is such a serious issue for venues with 20+ avatars or so, that I decided to publish new releases to fix this today !