I presume you mean "improved climb" in the context of performance.
V2 (the one engine inoperative initial climb speed) is normally 1.2 X Vs (Vs= stall speed). However the best angle of climb speed, in the take off config, is in the range of V2 + 15 to V2 + 25.
In the case where the aircraft is below the "runway" limit, V2 may be increased above the minimum in order to secure a better angle of climb after take off.
However, in practice the procedure of improved climb is used to increase the take off weight so although the use of a higher V2 improves the angle of climb this is countered by increasing weight up to the point where the angle of climb is not less than thw WAT limit (2.4% gradient, I think)!
If V2 is increased then this will generally affect V1 and VR also.
Hope this helps!
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