Generally .NET Core 2.1, as promised, is quite faster, but not how expected. Access to disk to read configuration with .NET Framework is sensibly faster.

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Direct Creation: [new InMemoryRepository()]

419,0705 ms total -- 0,001676282 avg ms per req

Custom repo hardcoded: [UserRepository : InMemoryRepository<User,int>]

426,1627 ms total -- 0,0017046508 avg ms per req

From config file: [RepositoryFactory.GetInstance<User, int>()]

102343,4275 ms total -- 0,40937371 avg ms per req

From config obj: [RepositoryFactory.GetInstance<User, int>(config)]

994,6524 ms total -- 0,0039786096 avg ms per req

Custom repo config: [UserRepository : ConfigurationBasedRepository<User, int>]

951,6363 ms total -- 0,0038065452 avg ms per req

StructureMap w/ config: [container.GetInstance<IRepository<User, int>>()]

1303,3376 ms total -- 0,0052133504 avg ms per req

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Direct Creation: [new InMemoryRepository()]

502,4544 ms total -- 0,0020098176 avg ms per req

Custom repo hardcoded: [UserRepository : InMemoryRepository<User,int>]

496,9562 ms total -- 0,0019878248 avg ms per req

From config file: [RepositoryFactory.GetInstance<User, int>()]

114588,1645 ms total -- 0,458352658 avg ms per req

From config obj: [RepositoryFactory.GetInstance<User, int>(config)]

1128,9643 ms total -- 0,0045158572 avg ms per req

Custom repo config: [UserRepository : ConfigurationBasedRepository<User, int>]

1134,4413 ms total -- 0,0045377652 avg ms per req

StructureMap w/ config: [container.GetInstance<IRepository<User, int>>()]

1500,8608 ms total -- 0,0060034432 avg ms per req

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Direct Creation: [new InMemoryRepository()]

481,6651 ms total -- 0,0019266604 avg ms per req

Custom repo hardcoded: [UserRepository : InMemoryRepository<User,int>]

492,4091 ms total -- 0,0019696364 avg ms per req

From config file: [RepositoryFactory.GetInstance<User, int>()]

78535,0415 ms total -- 0,314140166 avg ms per req

From config obj: [RepositoryFactory.GetInstance<User, int>(config)]

1131,8681 ms total -- 0,0045274724 avg ms per req

Custom repo config: [UserRepository : ConfigurationBasedRepository<User, int>]

1141,7344 ms total -- 0,0045669376 avg ms per req

StructureMap w/ config: [container.GetInstance<IRepository<User, int>>()]

1470,2279 ms total -- 0,0058809116 avg ms per req