Software developer Megai2 has released his Guild Wars 2 DirectX proxy wrapper on Github earlier this week. The wrapper forwards DirectX 9 calls to their DirectX 12 equivalent to improve game performance.
The Guild Wars 2 d912pxy add-on was built specifically for the game in an attempt to decrease the API overhead of DirectX 9. By using the add-on this overhead is claimed to be reduced by up to 70 percent.
The performance improvements when using the wrapper are significant: a 23 percent increase of frames per second. This is welcomed because the game is still barely able to go above 60 frames per second on high-end machines.