Improved performance.

[jscarle]

BenchmarkDotNet v0.13.12, Windows 11 (10.0.22631.3155/23H2/2023Update/SunValley3)
13th Gen Intel Core i7-13700KF, 1 CPU, 24 logical and 16 physical cores
.NET SDK 8.0.200
  [Host]     : .NET 8.0.2 (8.0.224.6711), X64 RyuJIT AVX2
  DefaultJob : .NET 8.0.2 (8.0.224.6711), X64 RyuJIT AVX2
  Iterations : 100 000

Method	Before	After	Difference	Before	After	Difference
ResultBase.Errors[0]	51.91 μs	27.53 μs	89% faster	-	-	No change
ResultBase.HasError<IError>()	4,839.80 μs	94.39 μs	5027% faster	12.21 MB	-	Eliminated
Result.Ok()	168.40 μs	18.77 μs	797% faster	2.29 MB	-	Eliminated
Result.Fail()	1,195.60 μs	18.88 μs	6233% faster	12.21 MB	-	Eliminated
Result.Fail(IError)	1,029.60 μs	535.76 μs	92% faster	9.16 MB	7.63 MB	17% less
Result.Ok<TValue>(TValue)	195.30 μs	196.74 μs	No change	3.05 MB	3.05 MB	No change
Result.Fail<TValue>()	1,251.30 μs	19.06 μs	6465% faster	12.97 MB	-	Eliminated
Result.Fail<TValue>(IError)	1,013.10 μs	558.52 μs	81% faster	9.92 MB	8.39 MB	15% less
Result<TValue>.Ok(TValue)	196.30 μs	192.23 μs	No change	3.05 MB	3.05 MB	No change
Result<TValue>.Fail()	1,225.40 μs	19.04 μs	6336% faster	12.97 MB	-	Eliminated
Result<TValue>.Fail(IError)	1,018.30 μs	575.66 μs	77% faster	9.92 MB	8.39 MB	15% less
new Error()	225.80 μs	223.80 μs	No change	3.05 MB	3.05 MB	No change
new Error(errorMessage)	224.40 μs	225.02 μs	No change	3.05 MB	3.05 MB	No change

On average 1938% faster with 61% less allocations.