Once QQuick3DGeometry::update() is called, it will create a new QSSGRenderMesh, and previous memory and buffer can't be released in time.

In the official example：Qt Quick 3D - Custom Geometry Example，operate like following several times and you will see that memory and GPU usage get higher and higher.

I read source code and make some change that QQuick3DGeometry::update() can work in a safe way with Immutable vertice and face amount. Notice: If your custom QQuick3DGeometry need to update with Changeable verts and faces or several submesh in one model, it doesn't work. I hope the official will fix this bug as soon as possible.