Rancher ui notoriously slow

Accessing rancher ui is particularly slow, it takes approximately 12 seconds between the moment I enter our instance url and the page is fully rendered.

Listing pods for all namespace can take as long as rendering landing page.

It seems that `management.cattle.io.fleetworkspaces?exclude=metadata.managedFields` takes 8+ seconds and userpreferences?exclude=metadata.managedFields as well.

Versions :

Rancher = v.2.8.5

downstream cluster hosting rancher = rke v1.5.10 / k8s 1.28.10

number of downstream cluster = 4 (including the one hosting rancher)

number workload on rancher cluster = 116 (269 pods)