Hello Hill,
yes the 3 racer model is too bulky, when i exported the points for track locations i did not take into account having to rescale the model for visual appearance. (thus the high density *grin*)
for a single racer the track point interval works well.
will re-export placemark points at 3 or 4x the current distance interval which is 10m, this should make the 3 racer model much more managable
Thanks for the input.