realroad griplevel descreasing as soon as server is empty?

[cyrusyn]

I had session two days ago in a F1 machine where I posted a lap time of high 1.16. Then I went back to the server today and could not do higher than mid 1.17. The server had a lot of drivers in the past two days and rubbered up way more than I was on it two days ago yet I was slower by 1 sec with same tires and setting. Is the real road designed to lower the grip level as soon as the last driver leaves the server?