We're currently investigating stuttering and FPS inconsistencies while in port and in battle.
If you are submitting a support ticket, please include a WGcheck report.
I'll provide any updates on this thread as more information becomes available.
Did you submit a WGcheck report to the Support team via a ticket?
Also, sometimes the update files are damaged during download and installation.
If you perform a "check and repair" on the WGC launcher, it will correct any problems on the client.