There's always a place for another process viewer and recently one of my favourites has been bb.
The basic visualisation has been all I need to figure out where problems are occurring so far (Firefox, Chrome and Docker being the top three culprits) but a set of simple keyboard shortcuts allows you to switch to tree views and freeze the display while you look at things and have a think.
It's written in Rust but like the best Rust CLI's there's a lot of practical experience embedded into the tool. The design matters more than the language. Cargo makes it simple to install and remove so experimenting with it is easy.