Just as background about why you need to use DirectX 11 LegacyOriginally Posted by blazicks
WoW was recently improved to add multithreaded GPU rendering. Actually a misnomer because it's the rendering control processes on the CPU that became multithreaded. Each of those extra rendering processes now each take their own block of VRAM. Since patch 8.1 Wow-DX12 will happily eat 4GB VRAM or more. So even tho your card is expensive and super fast, 12GB it is not enough for 5 toons. When it runs out, each instance starts swapping to main DRAM which causes the lag. Initially the fix was to use DX11 which used a more reasonable amount of VRAM, but then they added multithreading to that too. Luckily they introduced a DX11legacy setting which works like the pre-8.1 DX11
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