The original Raspberry Pi is quite slow. But, the latest models are quite fast. I've run a variety of microbenchmarks and a RPi3B has twice the memory bandwidt

The original Raspberry Pi is quite slow. But, the latest models are quite fast. I've run a variety of microbenchmarks and a RPi3B has twice the memory bandwidth of a Sun V240 (which is many times the machine that a SS10 was.) It has roughly the same single threaded CPU/FPU performance and twice as many cores a the V240. Storage wise the microsd is faster than the SCSI drives you'd find in an SS10. The SS10 ethernet was 10 Mbps. You could add an SBUS adapter to get up to 100 Mbps, but that's it. Realistically, you would be able to support 10x whatever an SS10 would do. But if you hang your storage off that USB port, then you're likely to be pretty unhappy. But still would be more of a machine than an SS10.