Comment 1 for bug 1799811

I remember this was once a problem, but I am pretty sure this problem was fixed somewhere during 1.7-development. I tested it right now on Ubuntu 18.04 with Pinta-1.7-latest-development-build and this problem does not appear anymore, but I am sure in Pinta 1.6 this was unbearable slow.

Can you test it on Pinta 1.7 latest development build:
https://www.pinta-project.com/releases/