How do I get the optimal performance of SQL Server?

To maximize the performance of SQL Server, you must first identify several aspects. When these several aspects are optimized, the whole system performance can be improved to the greatest extent. You can then analyze these several aspects. Otherwise, you may not be able to do it.
Experience has shown that the performance improvement of SQL Server depends primarily on logical database design, indexing design, and query design.
Conversely, the biggest performance problem also often stems from these several aspects design flaw.
If database performance is a concern, you should focus on these aspects first, because a small investment here can bring a lot of benefits.
Other system-level performance issues, such as memory, caching, hardware, and so on, are really worth studying. Experience shows that the greater the capacity of the system in these areas, the higher the performance.
SQL Server uses automated management of existing hardware resources to reduce manual tuning at the system level.