This is the most badass mech keyboard:

https://ymdkey.com/products/id75-75-keys-ortholinear-layout-qmk-anodized-aluminum-case-plate-hot-swappable-hot-swap-type-c-pcb-mechanical-keyboard-kit

I have two of them, both with cherry silver keys, and yes I can type very fast on it. It does take some time to get used to it, but I think I have almost got my layout perfect. Just annoying lack of decent keycap labels, and strangely hard to find relegendables in europe.

My only wish is that this keyboard had 90 keys, 3 more rows, so I could have a full numeric keyset on the right, the arrows/pagers are in the middle, which does get annoying sometimes. I will probably reprogram them both at some point if I get some relegendables finally.