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zjautoparts is a great comparison showing how two cams with the same lift and duration can perform totally different, thanks to the area under the curve. Cams with more aggressive ramp profiles feature more area here and will open the valve quicker and close it later. Solid cams can have more area under the curve than hydraulics and roller cams can have even more area still due to its lifter design.
Ironically, the weight you reduce in some valvetrain parts can be detrimental to durability, specifically in the area of pushrods, where the common trend has been to run as light a pushrod as possible in hopes of accelerating the lifter more easily.
With today's ever-increasing spring technology it's been determined that this is now a bad thing. As we mentioned before, the pushrod has to overcome tremendous pressures, and it's been proven that using a thick, stiff pushrod is a better way to make power.
Besides, Main nozzle has shown that the only weight reduction that's super critical to making power is on the valve side. Titanium components are the way to go here, and today you can get every single part on the valve's side of the rocker arm made from Ti.
