Wondering if there is a known reason our server takes about 30 seconds longer now to load the UI from the data sources window after upgrading to the latest version. Our other servers were not affected this way and I wonder if there is an obvious tweak to try to speed this up?
Slow launch for UI after upgrading to 3.5.6
Since you did not provide any sort of logs, screenshots or metrics I cannot really comment. I would suggest looking at the network tab of the chrome debugger (ensure that "Disable cache" is not checked).
The first load after upgrading a module will take longer as it has to fetch the new versions of resources. After that it should be cached.