Decryption is faster than encryption (and it should be opposite?)

It seems that decryption is faster, but I googled that encryption should be faster (i.e. https://crypto.stackexchange.com/questions/6378/why-is-rsa-encryption-significantly-faster-than-decryption and several other places) Maybe there is performance bug and something could be improved?

OS: linux

use strict;
use warnings;
use Benchmarks qw/all/;
use Crypt::JWT qw(encode_jwt decode_jwt);
use File::Temp qw/tempdir/;
use File::Slurp qw/read_file/;

my $tmp = tempdir(CLEANUP => 1);

my $payload = { x => "x" x 1000 };

for my $keylen (1024, 2048) {
    my $private = "$tmp/private${keylen}.pem";
    my $public = "$tmp/public${keylen}.pem";

    system "openssl genpkey -algorithm RSA -out $private -pkeyopt rsa_keygen_bits:$keylen";
    system "openssl rsa -pubout -in $private -out $public";

    my $priv_key = read_file($private);
    my $pub_key = read_file($public);

    my $priv_o = Crypt::PK::RSA->new(\$priv_key);
    my $pub_o = Crypt::PK::RSA->new(\$pub_key);

    my $jwt_token = encode_jwt(payload => $payload, alg => 'RS256', key => \$priv_key);

    timethese(-1, {
        "encode ( $keylen )" => sub {
            encode_jwt(payload => $payload, alg=>'RS256', key=>$priv_o);
        },
        "decode ( $keylen )" => sub {
            decode_jwt(token => $jwt_token, key => $pub_o);
        },
    });

}

__END__
Intel Core i7-2600, 16GB RAM, SSD.
$perl jwt.pl
...................................++++++
....++++++
writing RSA key
Benchmark: running decode ( 1024 ), encode ( 1024 ) for at least 1 CPU seconds...
decode ( 1024 ): 1.08815 wallclock secs ( 1.08 usr +  0.00 sys =  1.08 CPU) @ 6636.11/s (n=7167)
encode ( 1024 ): 1.07056 wallclock secs ( 1.06 usr +  0.00 sys =  1.06 CPU) @ 1408.49/s (n=1493)
.........+++
...................................................................................................................................................................................................................................................+++
writing RSA key
Benchmark: running decode ( 2048 ), encode ( 2048 ) for at least 1 CPU seconds...
decode ( 2048 ): 1.04012 wallclock secs ( 1.04 usr +  0.00 sys =  1.04 CPU) @ 4306.73/s (n=4479)
encode ( 2048 ): 1.05303 wallclock secs ( 1.05 usr +  0.00 sys =  1.05 CPU) @ 336.19/s (n=353)

DCIT / perl-Crypt-JWT

Decryption is faster than encryption (and it should be opposite?) #12