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speeding up copy, attempt 1

Problem: repeatedly copying (relatively large) sections of text quickly makes the app sluggish until it has to be killed. (Thanks John Blommers for the report.)

When I instrument with prints, the sluggishness seems to happen in random draw() calls many times after I perform the copy.

I don't know for sure, but I'm initially checking if the cause is garbage generated by repeated string concatenation.

This attempt doesn't seem to make any difference.

Created by  Kartik K. Agaram  on June 9, 2022
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