Created attachment 112085 [details]
large map prior to commit 150ac07b

Bisect complete:

150ac07b855b5c5f879bf6ce9ca421ccd1a6c938 is the first bad commit
commit 150ac07b855b5c5f879bf6ce9ca421ccd1a6c938
Author: Michel Dänzer <michel.daenzer@amd.com>
Date:   Wed Jun 25 18:36:43 2014 +0900

    r600g/radeonsi: Prefer VRAM for CPU -> GPU streaming buffers

    Reviewed-by: Marek Olšák <marek.olsak@amd.com>

Prior to this commit, there is a slight fps drop (60->24) while moving around
the map for the first time, but thereafter it stays at roughly 60fps.