The RISC-V ISA can be fast.

Tenstorrent Ascalon, expected later this year, is expected to be AMD Ryzen 5 speeds. Tenstorrent hopes to achieve Apple Silicon speeds in a few years.

The SpacemiT K3 is about half as fast as Ascalon and available in April. K3 is 3-4 times faster than the K1 (previous generation).

This should give you an idea about how fast RISC-V is improving.