Disappointing, but not altogether surprising.
Some of the time the chat seemed to work - I could hear others, apparently they could hear me, but most of the time there was nothing or incomprehensible mumbling - perhaps it was Portuguese.
The races that were completed with, more or less, all drivers: Silverstone, Tremblant, Ricard looked to me like most other online races: pretty smooth when the cars weren't too close, stuttering when close - no better or worse than usual. Spa was OK for me except a number of the drivers seem to have been kicked out (I finished the race OK). Montreal was a complete disaster with everybody getting kicked out (I think). E when I was following you at Montreal, there was a period where your car was jumping all over the place, like GT5P lag, before we all got kicked out.
I'm not sure that we can run big grids anyway, but if we do, the only way to do it, IMO, is to have reverse fastest times, rather than "random", with the fastest at the back of the grid. That way, at least the faster drivers will be grouped together, because otherwise the driver starting towards the back has no chance against a a fast driver starting at the front, & the result will be no close races.
Personally, I think the idea of "pools" of 4 drivers, would result in less technical problems, AND closer more exciting races for everybody.