> I tried M-: (remove-overlays nil nil 'face 'whitespace-highlight) and
> it took about the same time what was the increment between first and
> other runs. Evaluating it when point is at bottom, very fast, but when
> point is at top, it is slow.
>
> I think you can easily test it by making slowtst.el a few times bigger
> and then measuring the run times.
I see. Please replace the two lines
(remove-overlays nil nil 'face 'whitespace-highlight)
(overlay-recenter (point-max))
by
(overlay-recenter (point-max))
(dolist (overlay (overlays-in (point-min) (point-max)))
(when (eq (overlay-get overlay 'face) 'whitespace-highlight)
(delete-overlay overlay)))
and tell me whether this improves things for your problematic file.
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