Some heavy sheets are unresponsive

Is there a problem with server speed?
I have been getting this when I try to edit

It used to take a bit before but worked. Now it is not working.
The sheet has plenty of formulas and lines.


We do have a server update last night, not quite sure if it’s caused by this.
Is it working as usual now? If not, would you mind sending a support ticket via “Need Help” and provide the sheet URL, which action you made and unresponsive?

I tried again today (taiwan night time) and it worked fast. Took just a few secs.