For optimal Internet and modem play we recommend that you turn off modem compression when playing since the game performs it's own packet compression. To do this, bring up the Control Panel (Start button/Settings/Control Panel), double-click the "Modems" icon, click on the "Properties" button and then the "Connection" tab. Select the "Advanced..." button, then uncheck the "compress data" check box.
Many applications perform better when using modem compression, so rather than
switching back and forth you may want to add a second, duplicate modem entry
which is always configured as being uncompressed. This entry will still access
the same physical modem, but you would use it instead for creating connections
to other modems or the Internet for playing Total Annihilation or any other
game for which modem compression is not desirable.