Questions about the efficiency of writing code

On the issue of writing code efficiency, all assumptions to write the entire process, reduce the server startup, debugging times, this is more time-consuming, some queries, information loading first all assumed, with
The whole process has been strung up and debugged again! and catch a fix! Write in this way, all the code together can be thought out, all assumptions, finally feel the function is OK, put
All the code that can be written is written, so you can debug it.

Questions about the efficiency of writing code