Re the scan log being broken: This will be also fixed in 2215+

As per the Mantis report, I confirm that an empty playing queue works around the performance degradation.
The Scan log is [url=https://www.dropbox.com/s/693agyhn257rmvv/GPM%20sync%20with%20empty%20play%20queue.png?dl=0]still appears to be broken[/url] ... not that it was any use in its previous state ... too much detail; no actionable information.

To be fixed as https://www.ventismedia.com/mantis/view.php?id=16128

[url=https://www.dropbox.com/s/err4b06bol02miw/GPM%20sync%20now%20very%20slow.png?dl=0]This image[/url] shows two first GPM syncs of a similar GPM & MM library:
[list]both syncs had the same options; Scan and only include contents that matches[/list]
[list]the top one was with the MM5 version of 1st September this year ... it took 6:39[/list]
[list]the bottom one was with version 2213 ... it took 1:45:15[/list]
[list]also the log report that it produced is missing all info[/list]

I turned on the debug logger when i came back after an hour and a half, and it was still running ... I PM'd the log to you.