Verified in 188.8.131.52. I imported 5k tags and then tried to open single group.
When Company tags were selected in single group it took about 20 secs to render the page. When I selected Vms & Templates and then selected different group it took about 1 secs, so tabs are loaded after they are selected.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.