It never happened to me that Boots of Speed break my formation. Everyone in my team stay at the same speed outside combat(maybe due to ie mod).

 

Actually I consider Boots of Speed to be one of the best random loots.

if they get stuck behind someone slow they stay in formation, if not they zoom, and I mean zoom, ahead.  The pathing in POE is pretty terrible so it can happen a lot.

 

 

According to my observation, the members with boots of speed just walk rather than run, thus keep exactly the same speed as their slower teammates.

 

Try it in stealth.

Try it in stealth.

 

 

Exactly. That's where the speed waddling starts with a vengeance.