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my %hash = (
  "very slow"  => 1,
...
  "fast"       => 6,
  "very fast"  => 7,
);

my @sorted = sort { $hash{$a} <=> $hash{$b} } @array;

my @array = ("slow", "very fast", "fast", "very slow", "acceptable");

very slow, slow, acceptable, fast, very fast