Not sure exactly the kind of stuff you are looking for, but...
ptkdb debugger
perldbgui debugger
Win32 pod viewer
Win32 GUI design tool
Perl TK Gui design kit
Search engine popped this link out... List of perl gui apps
I have also written several small to medium perl gui programs for linux and nt and never had any problems with performance. Usually, the only problem is lag time between new gui library release and perl bindings to them.

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