Yes, Bill you are correct, the article refers to an XP issue... I am currently trying to find equivalent symptom and solution for a Vista SP1 on Toshiba.
I found some issues and workaround. Thanks for the info about Native Wifi API.
After intensive searches, I realised that many factors are and it is most presumably a compatibility issue (driver, network adapter, compatibilty between the capacities of the router and the network adapter, etc.)
Anyway, I need to check the following
1 - Always use "Maximum Performance Mode" when on battery (http://support.microsoft.com/kb/928152) -
2 - Is it a lag issues ? Ping and check for any lag issue and if there is any, install the Vista Anti-Lag
3 - More stuff like compatibility issue and TCP autotuning (http://windowshelp.microsoft.com/Windows/en-US/Help/33307acf-0698-41ba-b014-ea0a2eb8d0a81033.mspx)
4 - Redoing the IPv4 configurations and disabling v6 & QoS could be a solution
5 - Checking the LAN configuration (802.11 a/b/g, b/g, etc.)
Will have to get full details of my wireless router and go in specific forum - Vista + Toshiba - to get the solution.