I can type in Dvorak, Qwerty, Zhuyin, and Kana direct input. If you are a slow typist, the problem is not the layout. It is an overreliance on looking at the keys and not taking the time to learn the layout by muscle memory. My keys only have labels for Qwerty but I can touch type in four different formats because I forced myself to use them. That process works. The individual layout does not matter much. How ergonomic the keys are also doesn't matter much. The limit is likely you.