faster,
when you say it's lagging, can you describe in a bit more detail what it looks like?
For example, is it just the other cars on the track which seem to dance around and don't move smoothly, or does the whole picture seem jerky, including the trees, buildings etc. as you drive past them?
If its just the other cars but everything else is smooth then it could be the connection, but if the whole scene is jerky then it could be that frame rates are dropping when there are lots of other cars in the track.