My website slowed waaay down because of this 3rd party code... (FYI post in case it helps someone, not a question)

I've spent the past 6 hours trying to figure out why my website suddenly began loading at a snail's pace, despite not having made any changes to cause this. I started with a customer service chat, which was not particularly helpful. After resizing many images and removing social media blocks etc., I went went through all third party code I'd injected and discovered that Squarespace NinjaKit by IX Studio was the culprit. Their website is currently down, so I'm not sure whether it no longer exists or if this will be something that is repaired, but it shows that the Chrome extension has over 1,000 users so I thought it might be helpful to post here in case anyone else is searching for why their website is all of the sudden taking 10 minutes to load.

I have no knowledge of @IXStudio's Ninjakit or how it works but if their domain is down it may be possible that the code you installed is trying to reach the IXStudio domain for some info and can't get there, thereby causing issues.

A possible explanation but obviously not a solution.

Another post on the same topic?

It appears that the domain is back. I'm not seeing signs of it being for sale.