Adobe Flash (Mac OS X) stutters when playing full-screen video [SOLVED]

I’m not sure when it started, but lately Flash (v11.6.602.171) has been stuttering like crazy when playing YouTube, BBC iPlayer or in fact any full-screen video. I tried uninstalling Flash, reinstalling, disabling plug-ins in Chrome and re-enabling, but nothing helped. After googling around for a couple of hours, plenty of other people are seeing the […]