The page loading when switching page took about 11 seconds to complete the load.
The response of the pushbutton and the indication which take 5 to 8 seconds.
It is very obvious for the larger site which has more items or functions in one page as the print screen attached.
All the Tanks and MOVs have popup window function.
Are you using UDTType parameters in your template(s)?
These would most likely be the culprits here. I never use UDTType parameters, and will always pass in the tag path for my templates, for many reasons not just performance.