Question about nextjs..

After using nextjs, the page movement time is very slow. I know React pushes nextjs, but when using react, I moved the page right away, but in nextjs, it feels like it moves too slowly. I doubt if ssr is the best. I think that csr should be selected separately or a better alternative should be created.
And there was a time when a custom was needed at the time of the route, but this is too internal, so it is a problem how to set it up. This developed an in-depth custom route according to the customer's requirements, but in nextjs, there are times when you can't get a sense of the implementation direction. What I'm talking about is customization. It's best to keep this as open as possible.
I use createElement and croneElement very usefully, but I was embarrassed to see that they were registered as legacy on the new React page. This is very useful for free customization.

此 issue 提到了 Next.js、React、SSR、CSR、routing 和 createElement，但沒有指出任何檔案、測試或進入點。首先釐清請求涉及 React 文件網站還是 Next.js 的行為，然後在實作之前定義一項具體且可測試的文件變更。