Slow play definitely affects tournament integrity, as it limits the amount of turns the non-slow player gets to take. Potential for abuse is high, because it's very hard to differentiate it from stalling, and it would be relatively simple to sculpt your deck decisions around being favored by limiting the number of turns each player takes.
IPG 3.3 Excerpt
“Philosophy
All players have the responsibility to play quickly enough so that their opponents are not at a significant
disadvantage because of the time limit. A player may be playing slowly without realizing it. A comment of “I need
you to play faster” is often appropriate and all that is needed. Further slow play should be penalized.”
When you're in extra turns, or in non-timed rounds, the penalty can still apply, however, because there's other potential for advantage, even if it's just from the judge falling asleep. Cautions are the most free thing ever, hand them out like candy for Slow Play, and your event will go so much more smoothly.
For the record, this doesn't mean I think that calling a judge would ever be slow play, although it could potentially be stalling. Just that there's no good reason not to pass these cautions around freely.
Edited Josiah O'Neal (June 30, 2015 04:43:51 PM)