Commit PR#1414 by kayru in 4.0-3926 has a negative effect on the Direct3D perfomance of ATI/AMD GPUs.
Quoted from the October 2014 Progress Report:
People who have tested this build with an NVIDIA GPU have experienced 5 to 10% performance improvement, but with AMD GPUs there's an up to 10% performance hit which is the exact opposite behavior.
Seems like AMD's GPU/driver combnation really doesn't like this change (or part of it).
Quoted from the October 2014 Progress Report:
Quote:D3D: Couple of small optimizations (PR #1414) by kayru
...4.0-3926 brought *another* sizable performance boost to the D3D backend. D3D will be roughly 10% faster than before.
People who have tested this build with an NVIDIA GPU have experienced 5 to 10% performance improvement, but with AMD GPUs there's an up to 10% performance hit which is the exact opposite behavior.
Seems like AMD's GPU/driver combnation really doesn't like this change (or part of it).