Not sure about performance, but CRA can be pretty bad if you care about things like SEO or your app working without JavaScript enabled. That's where Next.js and/or Gatsby.js come in. Next.js also gives you other neat features like code-splitting which as far as I know are not included in CRA. Not to say that CRA is awful or anything, I do have a couple of hosted apps made with pure CRA working just fine in "production", but using one of these frameworks definitely gives your app a nice boost.
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Not sure about performance, but CRA can be pretty bad if you care about things like SEO or your app working without JavaScript enabled. That's where Next.js and/or Gatsby.js come in. Next.js also gives you other neat features like code-splitting which as far as I know are not included in CRA. Not to say that CRA is awful or anything, I do have a couple of hosted apps made with pure CRA working just fine in "production", but using one of these frameworks definitely gives your app a nice boost.