As a point of reference on speeds and feeds...
I use
https://www.mcmaster.com/#3317A22 and
https://www.mcmaster.com/#3317a21/=15xtn9p for my side-business. We'll do sheet metal in a single pass, from 0.030in to 0.080in 5052 H32, at 24IPM/24kRPM (.001ipt cut load) with good results and excellent cutter life. Cutting single-pass is remarkably useful because you don't need to worry about re-cutting, which is the single biggest killer of router bits in my experience.
In thicker material we run around 0.05-0.06inch DOC and use an air-blast and dust collector to keep chips out of the cutting channel, with the same 24krpm and 24ipm travel.
We've tried running faster, but the machine doesn't seem rigid enough. It's a torchmate small-shop machine, mostly made from 8020 with a convoluted spindle mount.