Google Meet is definitely not going to perform better outside Chrome since based on recent web APIs proposed by Chrome (e.g. document PIP[0], element capture[1]), the Chrome team has shown they'll change the browser specifically to improve the UX of Google Meet.

[0]: https://developer.chrome.com/docs/web-platform/document-pict...

[1]: https://developer.chrome.com/docs/web-platform/element-captu...

Almost as if it's on purpose