It's a feature not a bug.

Manipulating the libs help you dynamically experimenting with different versions.

So whenever you are adding a new module to one of your libraries you need to adjust your static load-path solution again.

Are you really sure it's worth it?

I'm not aware of any standard way to do this or even a module for it.

That's how I'd do it.

I would dump %INC after all modules are loaded, because the values are the path where they've been found.

Then I'd set an @INC hook on the first position which loads exactly those recorded modules. See require

We just had a discussion on hooks.

Here a working example: [WEBPERL] dynamically importing non-bundled modules via http

What you'll need is a mechanism to deactivate the hook so that you can record the normal load paths again.

Like an extra flag in %ENV.

update

I should have mentioned that the usual way to avoid load overhead is a persistent process like with FastCGI or other deamon solutions like Proc::Daemon .

That's faster than your idea because it's also avoiding to compile all the code.