Computers are constrained in bus bandwidth as well, and it’s harder to add more. RC tends to require strongly consistent counter bumps on the bus even for objec

Computers are constrained in bus bandwidth as well, and it’s harder to add more. RC tends to require strongly consistent counter bumps on the bus even for objects whose exact lifetimes you might not care about so much. The costs of GC are amortized over more work, though the pauses can hurt.