When DX11 Beta launches, what I did was removed everything else in Guild Wars 2 folder except the data file and launcher.
Tested DX11 Beta immediately after it released, can definitely tell map loading took shorter time, less stutter. FPS wise not much improvement especially in WvW.
After ANET fixed with multiple patches, the game constantly crashing.
The latest step I took was again the same as above, and deleted all GW2 caches in my systems - in %temp% and %appdata% folder. Then perform GW2 data file repair, launch game and re-do Reshade. Game became a lot better, FPS got huge improvement and no stutter when moving camera around. In WVW I had standard model for ally and enemy, lowest Model Limit and Quality, Shadow - None, Reflections - None, the rest of graphic options are at highest possible. Blob fight I am getting about 70-80 FPS, this is great.
However the game still randomly crash like after 1-2 hours of gameplay, could not figure out what is causing it.
i7-6700k OC 4.5GHz - full time
GTX 1080 (Nvidia 471.96 with G-Sync On)
16GB DDR4
M.2 SATA SSD
Windows 10 21H1 (OS Build19043.1237)