I think there is something wrong with your Chrome browser. For example, from your picture I see that this BBR discussion thread (only one tab, not including browser itself) takes 234 MiB from your computer. In my case Chromium (Chrome) browser the very same thread takes 72 MiB total
(including browser itself, not just one tab, as yours):
Chromium - memory usage
Keep it simple, it'll become complex by itself...