Why is Geforce Now running slow on Google Chrome ubuntu 20.04?

guys, I have ubuntu os on a Chromebook but it was originally chrome os and when it was I was able to get GeForce now on google chrome and play Fortnite smoothly but now that I have google chrome on ubuntu os it's not so smooth do you guys know why. (FYI) I have a Chromebook 15 cb3-532 and ubuntu 20.04, I don't plan on streaming so I have no other software running.

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