Ok you had this same issue reported before here -> Videos lagging behind when in background
Is exactly i am experimenting right now, my brave is on spanish
Versión 1.0.1 Chromium: 78.0.3904.108 (Build oficial) (64 bits)
S.O : GNU/Linux
and under the options i can’t find some option for disable GPU Acceleration, i think can help me, because i just had 3 GB Ram, CL6, DDR2. and for some strange motive, with some web browsers consumes a lot of resources if i turn on the use of GPU like Chromium, Google Chrome, and Opera.