Here's another way that produces a tree whose leaf nodes have undef values:
sub paths2treeREPEL {
    my %tree;
  
    for (@_)
    {
        my $last = \\%tree;
        $last = \$$last->{$_} for split /\\/;
    }

    return \%tree;
}

[download]

FWIW:
        Rate   JDP JDP_c    GF REPEL
JDP    881/s    --  -23%  -53%  -63%
JDP_c 1140/s   29%    --  -39%  -52%
GF    1867/s  112%   64%    --  -21%
REPEL 2377/s  170%  109%   27%    --

[download]

In reply to Re^2: Parse a list of path strings into a nested hash by repellent
in thread Parse a list of path strings into a nested hash by jdporter

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