I was getting a rainbow effect or blur on some text, especially on white backgrounds. I found this fix in a Manjaro wiki that fixed the issue and thought it might be helpful to others that might have this problem.
That's a valid 'fix' and I see no problem with it being posted, though it is also available from other sources (Archwiki). I know I've had past issues with it in Xfce (long ago).
Since font rendering was a problem for you, and possibly is for others, you should also mark your post as providing the solution as well.
Job well done. And welcome to the Garuda Community.