- But the stall is uneven - affects some but not all
- visuals, visuals but not music, etc.
+ But the stall is uneven - affects some but not all visuals, or
+ sometimes visuals but not music, etc. It's like the event loop is
+ running but the front buffer is not flipping in.
+
+ The stalls almost disappear when connecting with desktop Safari
+ remote debugging, which... is confusing.