Collisions do NOT depend on connection speed.
Think about real combat...the attacker doesnt know what the target is going to do, and realizes that he may do something stupid. The attacker gives the target leeway, considering all the places he COULD be when the attacker passes.
If you do the same thing, YOU WILL NOT COLLIDE. And, they will not collide with YOU.
It doesnt matter what your ping is. If you dont want to collide, do not get too close -- and you wont collide, regardless.
I have cable, faster than DSL. I collide maybe once evey other tour -- and when I collide, I know it was my fault because I cut the margin too close or had the "ears pinned back and hair on fire" target obsession.
Pretend this is your only plane, and you dont want to die (at least when it comes to collisions). The "problem" will go away, really.