May I guess you're not using a Mac? For me it's using 100-150% CPU (according to Chrome task manager) and sound stutters constantly. Supposedly it works fine on Windows.
I guess you all have partially answered my question: most Zoom users are not using the web client in Chrome or Firefox (it doesn't run at all in Safari) on macOS; as noted above, its poor audio quality and broken features render it essentially unusable.
Unfortunately I don't trust Zoom's native app, and I don't want to reboot into Windows, though I guess I could make a "Zoom VM" or something. ;-(
Moreover, Zoom-based conferences that I've attended have been plagued by audio issues that have rendered the remote presentations largely unintelligible, even using a Windows client.
In any case, I've usually solved the issue by using anything other than Zoom when I have the choice.