http://bugs.winehq.org/show_bug.cgi?id=28509
--- Comment #9 from Astarte Viviani astarteviviani@gmail.com 2011-10-25 03:25:00 CDT --- Ok, sorry for the lateness.
That was it, modifying the registry as you said improved the performance such as it's now not much different from the 1.3.28.
Version tested (with and without the registry edit) is wine-1.3.30-145-g7a4349b. Will test on a newer version if needed.