All your problems seems to stem from the fact that Win32::GUI::DoEvents() isn't called during the operation.
Like
BrowserUK says, threads is exactly the right solution to this problem, but you need to be a bit careful to not mess upp the Win32::GUI XS code.
On the win32-gui-users list I recently posted two entries about my first attempt and the resulting module to do this in a fairly neat way.
It uses Thread::Queue to communicate between the main thread (the GUI) and worker threads that perform the long-running operations.
The demo application does a GET and updates the GUI (which stays responsive) with a progress bar while getting each chunk of data. It can be cancelled with a Cancel button in the GUI.
This works because LWP provides callbacks to allow this. If the module you wanted to use does the same it should be a fairly simple task to adapt the demo program to your situation.
/J
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