Benchmark: running Time::HiRes::time, time, each for at least 1 CPU seconds...
Time::HiRes::time:  2 wallclock secs ( 0.82 usr +  0.22 sys =  1.04 CPU) @ 1071260.58/s (n=1114111)
      time:  0 wallclock secs ( 0.70 usr +  0.31 sys =  1.01 CPU) @ 1816838.61/s (n=1835007)
                       Rate Time::HiRes::time              time
Time::HiRes::time 1071261/s                --              -41%
time              1816839/s               70%                --

##</code><code>##

($counter += 1) %= 5;    # 0, 1, 2, 3, 4, 0, 1, 2..4, 0..4, 0..4, ...
($counter += 1) %= 256;  # 0..255, 0..255, ...