I recently started having some FPS drops without UPS suffering.
I started inspecting the debug options 'time-usage' and 'gpu-time-usage'
Since yesterday I get the following regularly in the 'gpu-time-usage' view, resulting in 5-10fps:
(With no significant changes in the 'time-usage' view)

As you can see, 'Wait For Update' accounts for 97% of the time spent on a frame...
Yet I can't find any reason why it waits.
GPU and CPU load isn't even close to maxing out.
Also, when this occurs, one moment it's fine, then it slowly builds up, untill it reaches 100-200ms per frame, then it stays at that level for a while, then it drops down to normal levels again.
Does anyone know what this metric actually means?
I could not find anyone with the same problem anywhere else.
Some more information:
I am playing on a multiplayer server, that I host on the same device.
Other people on my server lack the brain capacity to investigate if they have the same issue.
Thanks in advance