I think that this is boiling down to an issue in the design of the
internal datastructures of the editor. Specifically, they use a linear
data structure to record each line and so very very long lines like
that are going to cause performance problems, generally speaking.
Below is an example
I spoke too soon about continuing to edit as normal: actually, I can paste
text and use backspace after the long line, but attempting to type anything
further on in the file renders DrRacket unresponsive. Sometimes, when I
"Force Quit" DrRacket (Mac OS), a DrRacket error window flickers onto the
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