What did you mean by this then ? - "Which means , for my eyes, that the modern big bikes already are too fast for the circuit". The road/corner changes at Quarry, Windy and Brandish weren't specifically/uniquely made to make the bikes go or lap faster they were made to improve the ease of use for the public with their cars/bikes/trucks etc on open roads and much of the road surface improvements and repairs are what happens naturally over time with repairs due to degradation, if they wanted to make it "easier" and faster then the run from Ginger Hall to Ramsey would get properly smoothed out - but it hasn't has it ?. The only part of the circuit I can remember being specifically changed/worked to aid the racing on is the crest of Bray Hill where there was road planing works involved with the bump and manhole cover after the tragic sidecar race in 1978. The recent changes at Hillberry involved closed road speed testing but again the road surface was due for renewal and the racing was taken into account, it wasn't specifically changed or altered because of an intrinsic problem with bike racing or to make the bikes faster through there - the dip/depression on the apex area is still there. The course is what it is and is matched by the evolution of man and his machine and speaking from a fair bit of very personal/mates/fellows experience since growing up on the IoM - a racing bike is never ever going to be too fast.