I think the big issue with bytes/cycle comparisons right now is that once you get to multiple bytes per cycle, most people are going to be limited on I/O, even to RAM probably. I assume Meow Hash was designed to run on high end workstations, but if you are developing software for end users my guess is that Meow Hash will end up being not significantly faster than xxHash.

Of course, if you are running a lot of hashes in parallel, I bet things get more interesting. (Example: would AES-NI instructions scale in parallel as fast as ordinary bitwise/vector instructions?)

ram throughput isn't that different on a cheap to high end pc.

When I say high end workstation I really do mean workstation and not gaming PC. Most people do not have quad channel memory on their home PCs but it is in fact a pretty good step up in throughput.