The proprietary AMD Vulkan driver wasn't tested this round since Radeon Software (AMDGPU-PRO) isn't yet supported by Ubuntu 19.04 nor is it likely to be supported soon since AMD doesn't tend to support the non-LTS releases these days with their hybrid driver model.
Also, see this video on how to install it: https://youtu.be/97fj4bGJxVM
However, I did not tested it with vulkan yet. You may try it and if it succeeds, add comparison results to the article.
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