Distorted text on MacOS. How to stop?

With LibreOffice (and prior versions going back at least a year), when I scroll down the text gets garbled and takes time to eventually settle.

Is there a fix for this? Alt+Tab to another application and back corrects the picture. But scrolling makes it blurred in this way again.

I have the same problem with on OSX Mojave.

You could try the latest releases, but note that these also have other font rendering issues tdf#122218.
What you are reporting seems to be linked to tdf#46988, where a decision was taken to deliberately remove a “smooth scrolling” option from the macOS version of LO, in order to vastly improve performance, and as it turns out, doesn’t even appear to work anyway on other OSes.