Not really sure. That was the key to replication of the originally reported bug (which also with datetime inputs): [Bug-12704] DateTime Input cause timeout in preview mode when zooming out
It’s possible that they’re unrelated, but it seems too coincidental to me. We also need to upgrade the version of the open source component library we’re using - it’s possible it was a bug on their side. You could check whether the sandbox examples cause any problems:
https://blueprintjs.com/docs/#datetime/datepicker