In terms of performance, I think you will have to give it a try yourself on your machine since specs can vary.
Being better than Webstorm? Not sure. I can say that Webstorm does provide more features out of the box than VS Code, so it all depends if you like or not having to download a few handy extensions or just get straight to coding after installing your tools.
You can refer to this and this other article to check out other people's reviews.
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