https://www.nhl.com/video/lafreniere...254/c-15354271
Here's a goal from this year, against us, where his straight line speed is on display. I definitely wouldn't say it's deficient. He's no burner but I don't think you can argue he's not fast enough on ice to be an NHL player.
Agility is an interesting question- is his fast burst speed up to snuff? Perhaps not, but I think that's addressable through training.