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there's another damper performance indicator called hysteresis. basically, hysteresis is a difference in how the shock behaves based upon conditions. if a shock produces 200lb rebound force at 4 in / sec, but only 170lb rebound force at the same velocity immediately after hitting a bump, we have hysteresis.
essentially, hysteresis is degradation of performance that occurs during use resulting from internal construction. this can be caused by sticky seals, cavitation, or a host of other issues.
the following chart is a velocity plot of my front damper at 'max' setting. the outer-most lines are while the shock is accelerating; the innermost are while the shock is decelerating. the difference is hysteresis. it's in the neighborhood of 6%; not great, but not bad. probably average. for the price, i'd say it's pretty amazing actually; i expected much worse.
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