Is this the speed at which public keys are checked in the hash table (using a bloom filter?)
Yes.
I am runung custom compiled BSGS with 1TB RAM on AMD EPYC x2 (128 cores)
bpfile size ~704 GB
bloom size ~110.47 GB
Wow, that's a cool config you have. When I tried to search for keys before, I did not reach a speed of more than 2 Ekeys