Text rendering quality of Gio at small sizes is currently not on par with other toolkits. For example, the quality of text on a GTK3 app appears sharper, thicker and clearer compared to that of Gio, which appears a bit blurry at smaller sizes.
The following screenshots are of a GTK3 based text editor (higher quality text rendering) and a Gio app (blurry text) rendering
Go regular font at size 16px
This ticket is a result of discussion at https://lists.sr.ht/~eliasnaur/gio/%3CCABydZCyyhYKih3CahOXzG-2hZm4Vz9DR0ypTny7VivbQDLJguw%40mail.gmail.com%3E