apc problems on win7-64bit

Hello all

I'm using php 5.3.8 + apache 2.2.21 from apachelounge, and the latest APC from Pierre's builds 
(php_apc-3.1.8-dev+igbinary-1.1.2-dev-20110321-5.3-ts-vc9-x86.zip), on a win 7 pro 64 bit machine.

I am testing perfs using eZ Publish, and I have a very strange behavior: when APC is enabled, only a few files seem to be cached (less than 20). When running 
the same app on linux, more than 120 files are cached.
Also the time to execute a page does not decrease at all - running ab with a concurrency of 1, I get 1.2 secs per page.
I tried playing around with stat, include_once_override and canonicalize settings, and did not get any significant difference (note that eZ Publish generates 
its own php files on the fly, so keeping stat on is generally a good idea).

I noticed when turning stat off, that the list of files in apc cache (as per apc.php) have conflicting pathnames: some are full paths, some relative, some use 
windows slashes, some unix slashes. Might this have an impact? (note: there is no stream wrapper usage in eZ afaik)

Is this a known problem / did anyone else experience it? Shall I file a bug?

Bye
Gaetano