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.

Issue này đề cập đến Next.js, React, SSR, CSR, routing và createElement, nhưng không xác định tệp, bài kiểm thử hay điểm vào nào. Trước tiên, hãy làm rõ yêu cầu liên quan đến website tài liệu React hay hành vi của Next.js, sau đó xác định một thay đổi tài liệu cụ thể và có thể kiểm thử trước khi triển khai.