Optimize dialup modem connection

Only use TCP/IP for the Internet connection (For performance and security):

Open the Control Panel
Double click the Network and Dial-up Connections-applet
Right click your dial-up connection and choose Properties
Select the Networking-tab
Uninstall or untick all Components except Internet Protocol (TCPIP)
Select the Internet Protocol (TCPIP) and choose Properties
Press the Advanced-button
On the General-tab tick Use IP header compression (Can increase ping time, but will improve download)
On the WINS-tab tick Disable NetBIOS over TCP/IP

Optimize the connection to the dial-up server:

Open the Control Panel
Double click the Network and Dial-up Connections-applet
Right click your dial-up connection and choose Properties
Select the Networking-tab
In the dial-up server drop-down box select PPP:Windows 95/98/NT4/2000, Internet
Press the Settings-button and configure the PPP Settings:
- Check Enable LCP extensions (Unless having problems with connecting to ISP, More Info RFC 1570)
- Uncheck Enable software compression (Unless using a Winmodem)
- Uncheck Negotiate multi-link for single link connections (Unless using multiple modems, More Info MS KB307849)

Optimize the hardware features for the connection:

Open the Control Panel
Double click the Network and Dial-up Connections-applet
Right click your dial-up connection and choose Properties
Select the General-tab
Press the Configure-button.
- Check Enable hardware flow control
- Check Enable modem error control
- Check Enable modem compression (Unless using a Winmodem)