Very good point.
However, whats interesting is the harder D/Ts not the 1,5/1,5 and in the harder ones it is enough with let us say the latest 30-50 founds. Today only 9 people have more than 30 D/T laps, and 3 have more than 50 laps (wich is crazy!!)
Maybe one more limit is that the only D/T that is clickable is over 3/1 or something close to that?
That would lower the resource-intensive part quite much.