It could also be that the mac OS and internals aren't as robust as Linux for example. Linux has far more people tuning the bits under the hood. Very true, under Linux Lutris is just running the Windows binaries though, the only Linux tweaking happening is with the wine build and the dxvk dll changes. My Linux step also runs a lot less background processes, so this could also help. I'm just not sure GW2 has a Mac user base large enough to justify ANet to switch the Mac Client to Metal(2). There will be a lot of programming involved, it took Blizzard a while to sort out WoW but it really does make a difference. One has to also bear in mind Apple don't allow developers direct access to hardware registers etc. for GPUs, they have to go through the Apple API's and if those aren't top notch or optimised then you're going nowhere fast. Bear in mind Apple optimise for stability, not speed. I just hope ANet flip to Metal as it makes a huge difference.