There are some performance/stability issues currently with picom. From my experience of using compton and picom I would recommend packaging both compton 5.1 (https://github.com/yshui/picom/releases/tag/v5.1) and current picom.
- Bug#908533: compton: Change compton sources GSR
- Bug#908533: compton: Change compton sources GSR
- Bug#908533: compton: Change compton sources Vladimir K