When I read the first sentence, I expected the author to use `git bisect`.

However, what the author seems to have done is used a prompt with claude that probably looked something like this:

"Some piece of code is causing the page to load very slowly. To debug this, I'd like to use binary search, where we keep commenting/uncommenting 50% of the remaining code, and then I manually check if the page is still very slow. Let's start now; Comment out a component (or parts of a component) that you estimate is 50% of the page, and I will tell you if the page is still slow."