I've said it before and I'll say it again: If you want to speed up your application, don't look at your code, look at your data access. The two slowest things you can do in application development are ...
The most important performance-tuning technique available is having the needed indexes created on the tables to ensure that the SQL Server database engine is able to get the data that it needs to as ...
SQL Server's OpenJson function will let you dismantle JSON structures into relational tables, including tables with foreign/primary key relationships. As I noted in an earlier column, JSON is great ...