So with things progressing in MIXO (beatgrids etc) I tried it on a large collection (25,000) tracks

I noticed in the Progress the Tracks counting down ~100/minute. Got most of the way and the analysis count then started. It seemed to hang after a few thousand, so restarted and it seemed to progress again (had to do this a few times). After a few hours of this it seems to have progressed through them.

Now with what seems the full collection analysed, opening MIXO takes a few minutes to resolve listing the playlists... then .... either trying to go to Support to confirm the progress or Export to attempt that.. it's just stuck

Have you tested under a large collection?

I'd test a subset of my higher folders, but need the folder selection implemented.