I have just given it a quick test on my Cloud instance and it appears to be working ok, Is it possible that your instance is busy and the timing is just unfortunate?
Can you share the cloud username so we can check the logs for the instance?
How much memory is available for the cloud users? Whenever am running huge data sets( well, not that large, 500 or so Items that I comfortably run on other clients self hosted) I get this error.
This is the third workspace to have these issues. At times its hard to vouch for the cloud platform over self hosting due to such challenges
Page Unresponsive is not related to the memory available to the cloud instance and it is a client side side issue normally caused when running more data than the browser can handle. A browser tab typically has 2GB of memory available to it which can cause some problems with larger workflows when testing in the UI.
Running the workflow in the background from a schedule would normally be ok but we would recommend using sub workflows for better memory usage. If a cloud instance runs out of memory you will normally see a connection lost message and the 503 errors.
The memory available on each cloud plan is below
Start: 320mb RAM, 10 millicore CPU burstable
Pro (10k executions): 640mb RAM, 20 millicore CPU burstable
Pro (50k executions): 1280mb RAM, 80 millicore CPU burstable
I got a few clients both working with different hosting needs. I got an instance running on railway and my pc myself and te clients use various hosting providers
On ALL that are self hosting, I rarely if Ever, experience the issue. But for the cloud hosted ones, I am almost certain to get a few such errors in due course of my automations
The only way to increase the memory on cloud would be to change packages but the cloud memory is very unlikely to cause the browser issue you are seeing, I see it on my self hosted install sometimes that has lots of memory.