Pace of Trades shows the speed or pace of tape and it's helpful to measure the effort and result.
As Wyckoff says: Volume provides Effort and the action of Price is the result. It takes Effort, in the form of Volume, to drive Price upward
How to use Pace of trades:
We have a high selling acceleration (effort) with a price movement, after that the buyers made a big effort trying to push the price up again but the price didn't turn up (they wasn't get a correlative result of their effort) and the trend continue while the sellers still accelerates the price down until a small effort by buyers reverse the trend.
Big buying acceleration (effort) pushing the price up and a big selling acceleration with ho result let the trend continues, after a high buying acceleration again (effort) the price it's pushed in a new highs, afther a while the buyers are retired from the market and the sellers tund down the price with low efforts (accelerations)