Bitcoin IS fast, it has to be to be a good money system, but a permissionless PoW based monolithic blockchain isn't necessary for speed, it's necessary for freedom.
Bitcoin Core is fast? Could you run Memo on Core? The high fees due to using SegWit instead of raising the TX limit from 1mb to at least 8, is why we're using Memo on BCH.
Oh, so the BCH branch, even with the various contentions going on - SV (Santoshi Version), ABC (Adjustable Blocksize Cap), ETC (Et Cetera). https://bch.gg/bchabcvsv