Comment 25 for bug 1563287

The 'buffering/GL' logic changes were installation of EGL sync points during GL draws so that software clients (eg, Xmir) have synchronized buffer releases. (fix https://bugs.launchpad.net/mir/+bug/1517205).

Poking around this today, it seems that the actual installation of the sync points has some time cost (we have more cost on each buffer mapping with that proper synchronization). So, if many buffers need mapping, the time cost adds up. It is unreasonable that the driver should have any cost when calling eglCreateSyncFence, but that's mali code we don't have much control over.

We have quirks that allow for disabling the synchronization, but we should avoid that if possible.