Revert "Allow arbitrary number of threads"
Revert "Allow arbitrary number of threads"

This reverts commit cd45b9cb7fee144b3beca010c404b65eca22a682.

EuropecoinEUORG/Europecoin-V3,LIMXTEC/Europecoin-V3,LIMXTEC/Europecoin-V3,LIMXTEC/Europecoin-V3,EuropecoinEUORG/Europecoin-V3,EuropecoinEUORG/Europecoin-V3,EuropecoinEUORG/Europecoin-V3,LIMXTEC/Europecoin-V3,LIMXTEC/Europecoin-V3,EuropecoinEUORG/Europecoin-V3,LIMXTEC/Europecoin-V3,EuropecoinEUORG/Europecoin-V3