I've done some homework here :-D, and it seems I found some root causes... They are (I suppose):
- Netgear WGR614v9 WiFi Router Setup, Wireless Settings
--> I changed Channel from "6" to "11" (after inpecting my wifi neighborhood and realised which were the less and best channel available using inSSIDer Windows Tool: Change Your Wi-Fi Router Channel to Optimize Your Wireless Signal - How-To Geek)
--> I changed Mode from "b and g" to "g only" (in order to inscrease speed, since both VONETS VAP11G WiFi Bridge Dongle Wireless and Netgear WGR614v9 WiFi Router are 802.11g certified WiFi devices)
- Netgear WGR614v9 WiFi Router Setup, Advanced, UPnP
--> Turn OFF
- SMS ver2.8 rev3 Network settings, under SMB/CIFS Network Protocol I changed to "manual full 10Base-T" (in order to keep both freezing and stuttering away from my AVI movies)
- OPL rev590 without "-DFORCE_100M_FD" makefile compilation directive (the same principle used for SMS and procedure which solved stuttering for my NAS when directly wired to my PS2 Console)
Up to now, the results for WiFi SMB are: AVI movies on SMS and FMV movies on OPL are stuttering less than with USB 1.1 connection, but they are still stuttering more than with wired ethernet (SMB) connection.
BTW: I also tried this "Turning off WEP and WPA may increase network throughput, but exposes your network to hackers. This is not recommended, except for testing purposes." stated on Netgeart support site, haven't made any improvement on SMS/OPL performance, as far as I can notice.
doctorxyz's PS2 & PS3 stuff: (http://psx-scene.com/forums/f257/doctorxyzs-ps2-ps3-stuff-101348/)