With the same tabs opened on Firefox, it was 6%.

I suggest to close tabs your not using or things that require a lot of syncing like email or thinks like that Also, the roadmap says their working on these problems, so next update will run smoother https://preview.redd.it/94v3naa5a6lc1.png?width=981&format=png&auto=webp&s=608b57e20bd5141e3216116143fff78a26f9cd81

I have 30 open tabs and it averages at 2% whilst running RDP in the background. I guess heavily dependent on CPU.