Same as you - macOS. I regularly have ~250-300 tabs open on my MBP (though I admit, I cheat via using The Great Suspender), the only time it hogs CPU is when some nasty advertising on sueddeutsche.de or Facebook decide they need to warm my lap.
In addition, I vastly prefer Chrome's devtools. Nothing comes close, and I believe this is a huge part of why developers are so Chrome-loyal.