From @dwarring

:

% git checkout https://github.com/cosimo/perl6-digest-md5.git
% cd https://github.com/cosimo/perl6-digest-md5.git
% perl6 -v
This is Rakudo version 2016.03-105-ga3b8fef built on MoarVM version 2016.03-84-g4afd7b6
implementing Perl 6.c.
% # benchmark -I lib
% perl6 -I lib -e'use Bench; require :​:("Digest​::MD5"); Bench.new.timethese(100, {'require-1' => sub { require :​:("Digest​::MD5")}})';
enchmark​:
Timing 100 iterations of require...
  require​: 0.3260 wallclock secs @​ 306.7511/s (n=100)
  (warning​: too few iterations for a reliable count)

But if I install the module, and require that​:

% panda install .
% perl6 -e'use Bench; require :​:("Digest​::MD5"); Bench.new.timethese(100, {require => sub { require :​:("Digest​::MD5")}})';
Benchmark​:
Timing 100 iterations of require...
  require​: 6.9965 wallclock secs @​ 14.2928/s (n=100)

That's vastly slower. I'm seeing similar results for other modules.

Note​: zef installation gives similar results.

From @zoffixznet

Still present in Rakudo version 2016.06-154-g55c359e built on MoarVM version 2016.06-9-g8fc21d5

zoffix@​VirtualBox​:/tmp/tmp.khD0mHbPlB$ perl6 -Ilib -e 'use Bench; require :​:("Digest​::MD5"); Bench.new.timethese(200, {"require-1" => sub { require :​:("Digest​::MD5")}})'
Benchmark​:
Timing 200 iterations of require-1...
require-1​: 1.5050 wallclock secs @​ 132.8885/s (n=200)

zoffix@​VirtualBox​:/tmp/tmp.khD0mHbPlB$ zef install .
...

zoffix@​VirtualBox​:/tmp/tmp.NwXDcnl6v4$ perl6 -Ilib -e 'use Bench; require :​:("Digest​::MD5"); Bench.new.timethese(200, {"require-1" => sub { require :​:("Digest​::MD5")}})'
Benchmark​:
Timing 200 iterations of require-1...
require-1​: 5.1958 wallclock secs @​ 38.4927/s (n=200)

From @dwarring

A rerun of the benchmarks on the same old x346 server​:

david@​X346​:~/git/perl6-PDF$ perl6 -v
This is Rakudo version 2017.02-233-g28a48ea built on MoarVM version 2017.02-38-g5845784
implementing Perl 6.c.
david@​X346​:~/git/perl6-PDF$ perl6 -I lib -e'use Bench; require :​:("Digest​::MD5"); Bench.new.timethese(100, {require => sub { require :​:("Digest​::MD5")}})';
Benchmark​:
Timing 100 iterations of require...
  require​: 1.3561 wallclock secs @​ 73.7388/s (n=100)
david@​X346​:~/git/perl6-PDF$ perl6 -e'use Bench; require :​:("Digest​::MD5"); Bench.new.timethese(100, {require => sub { require :​:("Digest​::MD5")}})';
Benchmark​:
Timing 100 iterations of require...
  require​: 1.0952 wallclock secs @​ 91.3046/s (n=100)

Slowdown from require of installed module has gone.

Now faster that uninstalled, partly because of a modest performance regression. But no major performance anomaly anymore. Closing this ticket.

On Sat, 09 Jul 2016 19​:45​:04 -0700, cpan@​zoffix.com wrote​:

Still present in Rakudo version 2016.06-154-g55c359e built on MoarVM
version 2016.06-9-g8fc21d5

zoffix@​VirtualBox​:/tmp/tmp.khD0mHbPlB$ perl6 -Ilib -e 'use Bench;
require :​:("Digest​::MD5"); Bench.new.timethese(200, {"require-1" =>
sub { require :​:("Digest​::MD5")}})'
Benchmark​:
Timing 200 iterations of require-1...
require-1​: 1.5050 wallclock secs @​ 132.8885/s (n=200)

zoffix@​VirtualBox​:/tmp/tmp.khD0mHbPlB$ zef install .
...

zoffix@​VirtualBox​:/tmp/tmp.NwXDcnl6v4$ perl6 -Ilib -e 'use Bench;
require :​:("Digest​::MD5"); Bench.new.timethese(200, {"require-1" =>
sub { require :​:("Digest​::MD5")}})'
Benchmark​:
Timing 200 iterations of require-1...
require-1​: 5.1958 wallclock secs @​ 38.4927/s (n=200)

@dwarring - Status changed from 'new' to 'resolved'