https://bugs.freedesktop.org/show_bug.cgi?id=82050
--- Comment #67 from Andy Furniss adf.lists@gmail.com --- (In reply to comment #64)
It's pretty clear that the stutters correlate with activity in "num bytes moved"...
I brought this up earlier and as was explained way the graphing/counting works may mean this is not related.
In summary AIUI the fact there is a pause causes a spike because the count is from the last frame rendered - which is way longer than normal due to the pause.