'improved climb analysis'. If a runway is very long (not limiting) the V speeds are increased, as to delay rotation. This will benefit the climb gradient later on (far out obstacle)
Or, more particularly,
(a) the aim is to get a higher V2
(b) in the main, V2 will determine VR
(c) V1 generally will be pushed high to minimise TOD, subject to ASDA comfort
(d) the climb benefit starts straight away
(e) obstacle clearance will be degraded until the intersection of the standard and overspeed flight paths. Just where this will occur depends on the numbers