why would my OneDrive suddenly be processing over 40,000 changes?

Facing exactly the same since this week of my post. Up to 1 Million changes Onedrive thinks it needs to progress with a slow pace of a few changes per second. I even let my laptop run over 24h to see what happens. However it starts over and over again like an endless loop. It also makes Onedrive un-operatable. Microsoft, you screwed Onedrive up again.

I read from another post on the same subject.

The response from Microsoft is WAIT AND DO NOTHING for now.

In my case i.e. with the average rate of 1 file/sec to process and I have apparently over ~1M files to process this is going to take ages. More or less leaving my laptop running and connected to the internet for 14 days (24/7) in a row. Microsoft you must be kidding that this is the solution. WAIT VIRTUAL ENDLESSLY.

Same issue here, processing over 275k changes for no reason at 12 per second.

Two things:

1. Microsoft products are really disgusting
2. Support is non existent

I have the same issue. I have 40k processing changes on 3 devices, and it's painfully slow. It seems to be blocking any genuine file synchronisation from taking place until it's completed (I hope)! Why is this happening?

I disagree, this sounds exactly like the original post.

Same problem. Looks like it's been 3 months with no solution or even acknowledgement from Microsoft. Time to finally seek a different service.