Look at this thread, this will work on all platforms on the manual entry. PC does now have an addon available that blocks this automatically. Try it, see if it works for you.

https://forums.elderscrollsonline.com/en/discussion/448084/psa-a-simple-trick-to-help-reduce-lag/p1

Addon for PC is ArkadiusGuildRosterUpdateBlock

For a number of people it has helped with long load screens including myself.