This appears to be caused by Cloudflare Error 524: A timeout occurred.
We have tried a number of tweaks, increasing timeout parameters on the server, reducing the products per ajax call, and while these have some effect, we don't seem to be able to get further than 1900 products being processed.
Does Atum have specific server requirements? Since it seems the ajax call to update all this is causing a timeout to happen after a certain amount of time. But the description suggests that it should be doing batches of calls via ajax, not one extended call. Please advise.