There are no longer brush tool artefacts on the canvas, which is very good.
Unfortunately, and maybe this is because of the repair, the brush tools are
now very slow.
On a computer with an Intel Core i5 processor and with a small image, say
640x480, the problem is not visible. With a large image, say 2500x4000,
using the brush tools is really cumbersome. On a computer with a simple
Pentium, the brush tools are almost unusable, even on a small image. This
seems to be independent of the brush used.
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