Hi
I would like to say that the best tip is to try your way out by deactivating the 3rd party drivers and apps.
Check enable debug logging on these drivers and and analyze the log activities simultaneously. Unfortunately, this is very time consuming to troubleshoot because it can depend on so many different things.
One tip may be to check this link for general troubleshooting of slow web pages.
https://community.servicenow.com/community?id=community_blog&sys_id=590e6a2ddbd0dbc01dcaf3231f9619b7
A third option that I tried to activate was @btk 's wonderful good guide to measuring the performance of the HE gateway using Node Red. It is easier to quickly troubleshoot with this running. Disable and see the difference quickly.
The picture below shows the time it takes to load my http://hubitat.ip/device/list page. It measures the time every two minutes and the picture below shows the last 24 hours.
I only have 45 activated devices. With 11 different 3'e party drivers.
Five different third party apps and thirteen different, but very active rules.
