There were many Lotuses and other light weight cars present, they seemed to quite serious about their pace and I only found out of the reason for this recently. They were taking part in a private championship that they hold at various track days, such as this one, specifically for light weight cars. It’s based on fastest times and their split up into classes based on performance, all pretty neat.
A very cool idea for those wanting to compete against friends or fellow people on forums.
Unfortunately it doesn’t always work for everyone. This is what happens when you get cars running at very different paces, pretty normal for open track days.