Tests performance of various String iteration methods
Typical run looks like this. Make sure to run tests as Release - totally different outcomes otherwise.
Starting test, 10000000 iterations set (base) foreach = 692 ms fastest to slowest foreach Span = 257 ms 62.9% Span [i--] = 291 ms 57.9% Span [i++] = 434 ms 37.3% for [i++] = 553 ms 20.1% for [i--] = 892 ms -28.9% Replace = 1932 ms -179.2% Split = 2220 ms -220.8% Linq = 3793 ms -448.1% complete UPDATE: Dec 2021, Visual Studio 2022, .NET 5 & 6
.NET 5 Starting test, 100000000 iterations set (base) foreach = 7658 ms fastest to slowest foreach Span = 3710 ms 51.6% Span [i--] = 3745 ms 51.1% Span [i++] = 3932 ms 48.7% for [i++] = 4593 ms 40.0% for [i--] = 7042 ms 8.0% (base) foreach = 7658 ms 0.0% Replace = 18641 ms -143.4% Split = 21469 ms -180.3% Linq = 39726 ms -418.8% Regex Compiled = 128422 ms -1,577.0% Regex = 179603 ms -2,245.3% .NET 6 Starting test, 100000000 iterations set (base) foreach = 7343 ms fastest to slowest foreach Span = 2918 ms 60.3% for [i++] = 2945 ms 59.9% Span [i++] = 3105 ms 57.7% Span [i--] = 5076 ms 30.9% (base) foreach = 7343 ms 0.0% for [i--] = 8645 ms -17.7% Replace = 18307 ms -149.3% Split = 21440 ms -192.0% Linq = 39354 ms -435.9% Regex Compiled = 114178 ms -1,454.9% Regex = 186493 ms -2,439.7%