Ken do you find your freezes are limited to a particular type of session.
I ask because I get the occasional 1 second freeze at all tracks whenever I am in an open practice server. It doesn't happen in offline practice, qually or race scenarios.
I believe it has also been noticed by other members and the only assumption I can draw is that it has something to do with the amount of folks coming and going from the server and their textures being loaded as you circulate
I'll give your setting a go and see if it helps.