# Fastest way to access a list that is a subset of an even bigger list

Say I have a list of objects called agents with 100,000 objects.

I have a second list called agents_per_step which refers to 39,393 objects in agents.

Say I need to access the agents in the reference list. What is the fastest way to access these objects?

I ran three tests:

1. Loop through a list directly containing agent objects
2. Loop through a list of indices referring to agents objects on a list
3. Loop through a list of indices referring to agents objects on a dict

I present the results below:

Turns out the winner is Method 1, looping through a list directly containing agent objects. Correct me if you can think of a way to make this run even faster!