<https://forums.getpaint.net/topic/31629-animated-images/page/14/#comment-579432>
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"Yep, it looks like an answer because you don't need to allocate memory for copying. Previously I observed a spike of memory usage and then decline, which is perfectly explained now,\n \n\n\n\tBut there is another problem - operation under layers selection are not working. \n\tSteps to repro:\n \n\n\n\t1. Select several layers from animated GIF (II was working with my file). \n\t2, Try to execute any layers command over selection. (I tried delete and merge down).\n \n\n\n\t3. The operation is executed only on focused layer.\n "
<https://forums.getpaint.net/topic/31629-animated-images/page/14/>