That means Apple has yet again messed up its graphics driver software that handles gpu acceleration. They seem to break one driver or another every few os updates.
So keep it checked for now. But after any macOS updates, try unchecking it to see if they fixed the driver bug they introduced yet. If not, recheck that setting until it is fixed.
Unfortunately, we never added that new disable preference to PageEdit so you will need to keep setting the environment variable and using open for PageEdit. I will add copying that new preference setting into PageEdit to my to-do list for a future release.
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