Toshiba disables TCP tuning to speed up web browsing as follows:
1. Click "Start" => All Programs => Attachments, find the command prompt, right-click and run as administrator.
2. Type the following command at the command prompt, netsh int tcp set global autotuninglevel=disable, and then press Enter.
If you need to restore, you can enter netsh int tcp set global autotuninglevel=normal in the CMD window running as administrator.