Robert,
I accept the process of zoom in and the process of zoom out. I'm confused that the memory is not the same after zoom in and zoom out. The memory shouldn't be the same for the same center and same zoom level?
If the memory keep increasing during zoom operation (for vector tiles basemap), the browser will be crashed in the end. It's terrible. Is it a bug to the vector basemap or how to avoid it if use the custom vector tiled map?