In specific, when should we leave images as they are and when should we swap it out for text?
Some Context: The question I am talking about is this one, it has an accepted answer though its pretty new and here is the edit I am concerned about.
The plausible performance problem: The question uses an image to display the resonance hybrids of derivatives of ethane. I thought I should convert it to text because text is more reliable than an image and can be expected to be retained for a longer duration. At least that is what I keep telling myself. While typing the contents of the image, I felt that it was a rather complicated expression that I was writing for the equivalent MathJax and by complex, I mean, really complex (for me) and it might be distracting to see the dollars giving way to the formulas and all the other reasons we may omit MathJax for something else. I searched the meta and this post, only to find nothing that could guide me.
At first, I thought I should ask on The Periodic Table chatroom, but then I thought, I should ask it here so that someone else might find it useful when seeking the community's take on this matter.
TL;DR The Question: To an editor, at what point would the performance of the webpage outweigh the suitability of the post's formatting, if any compromises should be made with either of them?
EDIT: I see that the edit has been approved so just to clarify, this post does not mean to revert the changes or cause any disagreement. It simply seeks general approval from the community and perhaps a more conclusive discussion on this facet of editing posts.