Replacement textures: Don't spend frame time waiting for a texture to be finished #20520
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This is some old logic that I don't think actually makes sense.
It's better to finish rendering the frame and have the texture ready for the next one, without wasting CPU. Even if we have a set frametime budget, it's too costly to waste it waiting for a single texture.
However, if the user set their texture load speed to "Instant", that means they never want to see any original textures ever. So in that case, we do still wait.
Fixes #20519