I assume "not slow", but depends on team composition. And if the lead wants clear to objective, then that's the pace we'll go at. They're the one who put stuff together and I prefer to encourage people who lead.
KM on ITFs are pretty standard just because that's a mine of XP. Heck, you can get nearly a level just by clearing after defeating Rom.
Speed runs can be interesting when you've done specific content a bunch of times and you want to see what can be shaved, but again, the lead sets the pace.
Add: I tend to wait until the lead exits the mission to exit.