Investigate Clone performance

[luizfbicalho]

PR to add the performance improvements to
clone method

#4272

BenchmarkDotNet v0.15.8, Windows 10 (10.0.19045.6466/22H2/2022Update) (Hyper-V)
Intel Core i7-10750H CPU 2.60GHz (Max: 2.59GHz), 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.300
  [Host]               : .NET 10.0.8 (10.0.8, 10.0.826.23019), X64 RyuJIT x86-64-v3
  .NET 10.0            : .NET 10.0.8 (10.0.8, 10.0.826.23019), X64 RyuJIT x86-64-v3
  .NET 8.0             : .NET 8.0.27 (8.0.27, 8.0.2726.22922), X64 RyuJIT x86-64-v3
  .NET 9.0             : .NET 9.0.16 (9.0.16, 9.0.1626.22923), X64 RyuJIT x86-64-v3
  .NET Framework 4.6.2 : .NET Framework 4.8.1 (4.8.9310.0), X64 RyuJIT VectorSize=256
  .NET Framework 4.7.2 : .NET Framework 4.8.1 (4.8.9310.0), X64 RyuJIT VectorSize=256
  .NET Framework 4.8   : .NET Framework 4.8.1 (4.8.9310.0), X64 RyuJIT VectorSize=256

Method	Job	Runtime	Mean	Error	StdDev	Median	Ratio	RatioSD	Gen0	Gen1	Gen2	Allocated	Alloc Ratio
FetchAndSerialize	.NET 10.0	.NET 10.0	159.9 ms	8.21 ms	24.09 ms	160.1 ms	1.02	0.22	-	-	-	116.46 MB	1.00
FetchAndCloneInternal	.NET 10.0	.NET 10.0	111.2 ms	2.22 ms	5.93 ms	109.9 ms	0.71	0.12	500.0000	-	-	69.24 MB	0.59
FetchAndSerialize	.NET 8.0	.NET 8.0	205.0 ms	9.34 ms	27.54 ms	214.5 ms	1.02	0.21	2000.0000	1000.0000	-	130.33 MB	1.00
FetchAndCloneInternal	.NET 8.0	.NET 8.0	158.7 ms	5.37 ms	15.57 ms	159.5 ms	0.79	0.14	500.0000	-	-	83.11 MB	0.64
FetchAndSerialize	.NET 9.0	.NET 9.0	207.7 ms	12.87 ms	36.51 ms	215.9 ms	1.03	0.27	2000.0000	1000.0000	-	129.79 MB	1.00
FetchAndCloneInternal	.NET 9.0	.NET 9.0	135.9 ms	5.46 ms	16.10 ms	135.2 ms	0.68	0.16	1000.0000	500.0000	-	82.57 MB	0.64
FetchAndSerialize	.NET Framework 4.6.2	.NET Framework 4.6.2	529.1 ms	10.55 ms	17.34 ms	526.8 ms	1.00	0.05	20000.0000	8000.0000	1000.0000	126.85 MB	1.00
FetchAndCloneInternal	.NET Framework 4.6.2	.NET Framework 4.6.2	356.0 ms	8.72 ms	25.03 ms	352.2 ms	0.67	0.05	13000.0000	5000.0000	1000.0000	79.72 MB	0.63
FetchAndSerialize	.NET Framework 4.7.2	.NET Framework 4.7.2	489.3 ms	9.75 ms	18.79 ms	486.0 ms	1.00	0.05	20000.0000	8000.0000	1000.0000	126.85 MB	1.00
FetchAndCloneInternal	.NET Framework 4.7.2	.NET Framework 4.7.2	337.0 ms	6.72 ms	8.97 ms	337.5 ms	0.69	0.03	13000.0000	5000.0000	1000.0000	79.72 MB	0.63
FetchAndSerialize	.NET Framework 4.8	.NET Framework 4.8	482.8 ms	9.47 ms	13.59 ms	481.0 ms	1.00	0.04	20000.0000	8000.0000	1000.0000	126.85 MB	1.00
FetchAndCloneInternal	.NET Framework 4.8	.NET Framework 4.8	334.8 ms	6.66 ms	6.23 ms	336.6 ms	0.69	0.02	13000.0000	5000.0000	1000.0000	79.65 MB	0.63

[StefanOssendorf]

Thanks for the PR. I'll have to take a deeper look in the next days but skimming through the test classes you are going all out :D