Multiple path-selectors are slow

[HazelGrant]

Based on this Discourse topic: https://discourse.openondemand.org/t/slow-when-using-multiple-path-selectors/3431

I can reproduce this issue in Firefox on an M1 Mac.

I'm adding this to the 3.1 milestone because I think it should be fixed before 4.0 if we plan on any further releases between now and then.

[HazelGrant]

My guess is this has something to do with the fact that $('#loading_icon') exists multiple times when two or more path selectors are present. Why this would make the selector slower, I'm not sure.