CHAPTER 6 Finding and Fixing Mobile Web Rendering Issues
If you would like to drill down to records of a particular type, you can
do this by using the Control+F shortcut (Command+F on Mac OS X) when
in the Timeline. Just enter in the name of the record type (e.g. “scroll”) and
Timeline will only show the records containing the term.If you’re wondering what those transparent bars in the Timeline mean,
these hollow frames correspond to one of two things: your JavaScript on
the main thread was busy doing something we forgot to show (instru-
ment) in the DevTools; or you were bottlenecked by your GPU.