M2 Pro was about 20-25% faster than M1 Pro, M3 Pro quotes a similar number. It has faster cores but a weaker distribution of them. Seems like a wash, but we'll see exactly how close when benchmarks are out.
That's only rendering speed, and M3 Max vs M1 Max (not Pro). M3 Pro is only 30 percent faster:
> The 12-core CPU design has six performance cores and six efficiency cores, offering single-threaded performance that is up to 30 percent faster than M1 Pro.