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Yeah, in a Reddit comment, Hector Martin himself said that the memory bandwidth on the Apple SIlicon GPU is so big that any potential performance problems due to TBDR vs IMR are basically insignificant.
…which is a funny fact because I had another Reddit user swear up and down that TBDR was a big problem and that’s why Apple decided not to support Vulkan and instead is forcing everyone to go Metal.
Valve should totally hook her up with one of those dev accounts that have access to games so she doesn’t have to pay for it themselves or get gifted them. She’s doing valuable work for the ecosystem.