Due to, um, reasons*, I just entered about 150 (I think) data points on the same goal in the space of about 10 minutes.
The result seems to be a graph that really doesn’t want to regenerate. The little bee just flaps forlornly over it until it goes grey and a big “Retry Now” button appears.
* A zapier task connected up to add one data point to a goal every time I add an item to goodreads. I was… more productive at doing this than anticipated.