Since DigitalPool keeps track of the duration of matches, it's possible to get a rough estimate of the relative speeds of the players. Here are the times per rack for everyone who had played more than 120 racks. These results are watered down because both players in a match get the average time for that match. A Filler/Pinegar match will move both their averages towards the middle (assuming Pinegar shoots

)
First number is average minutes per rack, second is the total number of racks played, even if they didn't get to shoot.
3.8 154 Joshua Filler
4.5 157 Shane Van Boening
4.8 125 Arseni Sevastyanov
5.0 142 Gregorio Sanchez
5.3 126 Lee Van Corteza
5.4 122 Roberto Gomez
5.5 152 Eduard Bregu
5.8 133 Nathan Childress
5.9 133 Fedor Gorst
5.9 138 Trenton White
6.1 150 Anthony Meglino
6.3 162 Marco Teutscher
6.5 187 Vitaliy Patsura
6.9 135 Oliver Ruuger
7.1 152 Jonathan Pinegar
7.5 128 Waleed Hashem
If you multiply the two numbers together, you get the total playing time for the player in minutes.