Rancher is too slow(1.6 version takes 10min to load)

Accessing Rancher UI is too slow and it may take upto 10min for certain environments.

It looks like a lot of secret volumes get created in some of the environments running for an year and feels like its the one making the rancher slow.

Cannot even open the storage section of rancher after its completed loaded, as the browser will run out of memory

Its difficult run the rancher with such slowness. Any idea to fix it or remove unwanted volumes from command line?