I think the CDS may have slowed down over the past couple days, and gotten really slow today.
See comment over on ERA5-CDSAPI-Extremely Slow download - #2 by Andrew_Janke.
Looking at the live CDS system status page, about an hour ago I saw this, showing a decline in daily volumes over the last couple days, and 0 downloads in the last hour.
Dunno if the metrics data for this page is delayed, and “0 downloads last 1 h” is a normal thing to see.
But I looked again just now, about 40 minutes after that last check, and now the “0 downloads” has rolled into the “last 2 h” bucket. So I think it might be real, and maybe the CDS is stuck.
ECMWF CDS support folks, if you’re reading this: could you maybe add a timestamp display to that live system status page, so that when users take and share screenshots of it like this, the info about when the snapshot was taken is included in the image? Like, maybe up at the top next to the users & requests account, or above it as part of the “System status” header? Got a couple other minor suggestions on my other comment, if you want to take a look at those too.