If your Internet connection is through a modem (dial-up), try removing the connection icon from your taskbar.  To do this, uncheck the "Show icon on taskbar" box in your connection settings configuration window.  This generally solves the problem. 

The problem can also be caused by resource starvation, other programs firing off in the background and a host of other things.

Resource starvation comes about if you have set the details of the game too high. These included, the game resolution, texture size, any anti-aliasing settings, or in-game slider settings being too high.

It is easy to eliminate the starvation issue. Turn everything in the game back to its basic setting and see if the problem goes away. If it does, then incrementally add back what you removedor changed until the problem is seen again.

For other issues, you can send a DXDIAG output to support@hitechcreations.com with a description of the problem. Include what the game shows in the CTRL-I information at the top center of the game screen (at the tower).