Span-ify your code.NET has introduced low(er)-level memory management APIs over the years that can dramatically reduce the number of allocations and improve performance, and first among them is Span<T>.
This repo demonstrates common usage patterns for some of those APIs.
[!IMPORTANT] Always benchmark and test the code for correctness, especially when using low-level/unsafe APIs.
Introduction to APIs and stack allocation
Creating and manipulating strings
Parsing and formatting values, by way of writing JsonConverters
Writing to buffers and streams
Optimize access to collections
Writing to the Console using UTF-8