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If you want to see how I did it, here you go. As I said, tiny project, but also a pretty minimal demo for switching in this case. I migrated to React18 in the same moment (don't ask why), so ignore the changes in src/index.ts.
use vite https://vitejs.dev/ it's super straightforward, fast and reliable
You should know that CRA is using webpack and babeljs for bundling and compiling the js, jsx to es5( based on your configs), and these two are pretty damn slow! you can change babel with esbuild which you can read here and also there are other articles out there... this will make a hige speedup for you because you are replacing those two which is written by javascript with esbuild which is written by golang that is pretty (fast](https://esbuild.github.io/), actually vite is using esbuild behind the scene and that is why its is super fast!