Comparing strings using the String.Length property or the String.IsNullOrEmpty method is faster than using Equals. This is because Equals executes significantly more MSIL instructions than either IsNullOrEmpty or the number of instructions executed to retrieve the Length property value and compare it to zero.
The .NET runtime initializes all fields of reference types to their default values before running the constructor. In most cases, explicitly initializing a field to its default value in a constructor is redundant, adding maintenance costs and potentially degrading performance
The value of a const field is computed at compile time and stored in the metadata, which improves run-time performance when it is compared to a static readonly field.
Qstick
Taloth Saldono