YouTubes html5 player seems to run very badly in epiphany. To reproduce it: - goto https://www.youtube.com/html5 and participate in the experiment. - Then watch a video without advertisement, eg.: http://youtu.be/FQCr9gIN1Yg - See that the video runs with about 2 fps unless you move the cursor above it which forces repaint. webkitgtk 2.6.2
Are you using Fedora?
Yes, Fedora.
Works ok with LIBGL_DRI3_DISABLE=1
Fedora should disable DRI3 until it's more reliable. It breaks tons of sites in WebKitGTK+. Other distros don't have this problem.
This is a Fedora issue.