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You don't mention it explicitly, but if you are using Thread::Pool, that is responsible for half your problems. The last time I tested that module it was badly broken and very, very slow. A quick look now and not much seems to have changed.
The other half is that you are trying to use non-blocking sockets on Windows via:
Which unless the powers-that-be have finally gotten around to fixing it, doesn't work on windows.
Also, mixing select processing with multi-threading -- in the way you have done it -- is fraught with problems. It can be done (correctly), but is actually rarely needed.
It is hard to assess your program given that you supply bits rather than the whole thing; and omit significant details -- like the modules you are using -- but you seem to be doing things in very complicated ways.
For reference, here is a simple -- but substantially complete -- pool-based, multi-threaded echo server, that runs very well under extreme load on my Vista machine without skipping a beat:
If you want some real help with your code -- rather than getting fobbed off with "Use this module I just found on cpan and switch to flavour-du-jour of *nix." -- you'll need to let me see your complete program (here or off-forum).
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In reply to Re: TCP Server hangs with multiple client connections