smartmatch is implemented in C
grep doesn't stop after matching.
Unfortunately all the use cases of smartmatch are hard to remember.
For repeated lookups a prepared hash scales certainly better.
You're free to check this with benchmarks or search for older discussions.¹
I hoped smartmatch could at least handle the stringification limitation of hashes, but nope:
DB<142> $h1 ~~ [$h1]
DB<143> 5 ~~ 
( addicted to the Perl Programming Language)
¹) Brian got deep into benchmarking :) http://stackoverflow.com/questions/3951812/how-fast-is-perls-smart-match-operator-for-searching-scalar-in-an-array
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