Rudder

There is a visible lag when one clicks on node tabs, which is reinforced by the short appearence of the "wainting" image, especially on compliance and system status page.

The delay is due to the fact that there is a ton of ajax request done at each tab change, which is very inefficient (it looks like the same global info are query each time).

See screencast attached below.

It may have been revealed by #24405.