Cripples speed of GitHub Projects board view

[aspiers]

I have just noticed that this script severely impacts the performance of the project board view, at least for a board which has probably over a hundred cards and quite a bit of other complexity (many labels, milestones, 13 columns, automation rules etc.) For example, dragging a card to another column takes several seconds, and everything feels very sluggish.

When I disable the script and reload the page, the performance instantly goes back to normal.

I didn't test it with a smaller project board so I'm not sure if the performance issue is related to the size of the board.