My experience it can make a huge difference.
Just guessing because a lot of this is proprietary but think it has to do with the bank of servers and actual cable connection going out to the ground based internet.
I'm guessing there are numerous servers associated with more than one cable/fiber leaving a Gateway. Each of those paths is assigned an Outroute ID to identify the servers and cable leaving the Gateway.
Again speculating, I was put on a new bank of servers and cable meant to support the new satellite in the future. It is not performing well.
All combinations of servers and cables perform differently.
Everything I'm saying could be fake news.
Now I'm gonna get slowed again.

I should just shut up and be happy I'm getting decent speed again. Bad Barbara!