Every time I visit the SOGo webmail I see this spinning circle. After a page refresh or clicking the “refresh” icon next to the inbox it is gone.
No ad-blocker or similar seems to be interfering.
I’ve had the same behavior for quite a while too (I use Chrome). It doesn’t appear to affect performance of the server (mind you I only have 2 users) but it is an annoyance. Interested to see if there is a resolution.