Try turning down the graphics sliders settings in the "Options" menu from the top left drop down menu's when you start the route. You may have to sacrifice some quality for processing speed. Experiment.
Improved the graphics and re-draw. Now, only have it occasionally just stop for 3-5 secs, and then it continues. Now thinking my newest computer with an Intel 3.0 dual core, and changing it's graphics from 512MB 8500GT to 2GB HD6850. http://www.hwcompare.com/5983/geforce-8500-gt-vs-radeon-hd-6850/
That will be a quantum leap.
Is there anything better that really will solve the problem?