I have a different experience with that: on a current MBP, Google office suite software (docs, slides, agenda, mail etc) regularly uses 100% cpu in safari for no apparent reason, and clearly also has some memory leaks were single tabs bloat to 2-3 gig memory... Have to kill the the threads manually. I would say it’s fairly unoptimized / pushes you to chrome
I second the experience of the other commenters. Keep it open long enough and it sucks up all the resources in non-chrome browsers. I also include Google Slides in my experience btw. It is more severe with Slides than docs.