Is too many trigger colliders and function calls very bad for game performance?

I am making a karting game and for the positioning system, I am using about 400 trigger colliders placed very close to each other around the track, and everytime the player or opponent enters one of them, a value increments in their script. Then every 0.2 seconds, a function call happens in the race manager script, which sorts a LIST (not array) of references (scripts) to each player/opponent, according to that value being incremented in the race. The index+1 of every player in the list represents their position. The positioning system works fine, and I am testing it with 3 players currently. I did not notice any frame rate drops when testing the game, but I was wondering if this is a bad idea and if I should go for another solution. Earlier, I tried the three way sort method where it first tries to organize players by lap they are on, then by the value I described, and then by the distance to the next checkpoint if two players are on the same upcoming checkpoint. I avoided this because I heard that vector3.distance can be expensive if called too much.