> I bet you're leaving some performance on the table without disabling danger > checks.
Indeed! I put my laptop in performance mode, and added the flags you used + --opt:speed. I tried -d:lto too, but it does not change anything. Some runs here: nim r -d:release -d:danger eratosthenes2.nim Found 23000 primes to 262146 for 1225 loops in 52 milliseconds. nim r -d:release -d:danger --opt:speed eratosthenes2.nim Found 23000 primes to 262146 for 1225 loops in 48 milliseconds.
