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$ perl -MBenchmark -e'timethese(10000, { map => sub { @_ = map 1, 1..1
+000 }, x => sub { @_ = (1)x1000 }})'

Benchmark: timing 10000 iterations of map, x...
...
Benchmark: timing 1000000 iterations of map, x...
       map: 17 wallclock secs (15.55 usr +  0.15 sys = 15.70 CPU) @ 63
+694.27/s (n=1000000)
         x:  9 wallclock secs ( 8.44 usr +  0.11 sys =  8.55 CPU) @ 11
+6959.06/s (n=1000000)

$ perl -MO=Deparse,-x7 -e'timethese(1000000, { map => sub { @_ = map 1
+, 1..5 }, x => sub { @_ = (1)x5 }})'

timethese 1000000, {'map', sub {
...
}
};
-e syntax OK