Aside from the API change, we didn't change any settings to test Doom's Vulkan renderer. Here's what happened.
Although the GTX 1080 Ti's average frame rate doesn't get any better with Vulkan on, its 99th-percentile frame time gets a smidge better. The Radeon R9 Fury X is the real beneficiary of this change, slicing its 99th-percentile figure nearly in half. It still can't quite catch the GTX 1070, however.
Fury X aside, our "time-spent-beyond" graphs are practically identical to our OpenGL results. The GTX 1080 Ti maintains its considerable lead at 8.3 ms, and it delivers sterling results at the 16.7-ms mark.
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