Pre-generate mipmaps?

Often when debugging framedrops I see (heavy) „generating MipMaps“ statements in the perfmon. I guess those are generated the first time a Geo is rendered ? Any subsequent update of the mip maps don’t seem to be heavy

Force cooking all ops doesn’t seem to trigger an initial generation .

Is there a way to pre-generate (on file load) mipmaps for the last TOP in a chain ?