[System.IO.File]::ReadAllText slow on OSX

[TheAngryByrd]

[System.IO.File]::ReadAllText seems to be slow on OSX. Paket is using ReadAllText (due to the fact there isn't any built in hashing) to compare two files.

    <PropertyGroup Condition="Exists('$(PaketRestoreCacheFile)') ">
      <PaketRestoreCachedHash>$([System.IO.File]::ReadAllText('$(PaketRestoreCacheFile)'))</PaketRestoreCachedHash>
      <PaketRestoreLockFileHash>$([System.IO.File]::ReadAllText('$(PaketLockFilePath)'))</PaketRestoreLockFileHash>
      <PaketRestoreRequired>true</PaketRestoreRequired>
      <PaketRestoreRequired Condition=" '$(PaketRestoreLockFileHash)' == '$(PaketRestoreCachedHash)' ">false</PaketRestoreRequired>
      <PaketRestoreRequired Condition=" '$(PaketRestoreLockFileHash)' == '' ">true</PaketRestoreRequired>
    </PropertyGroup>

It's fairly speedy on windows but on osx it's this case almost 10 times longer:

Windows:

Target Performance Summary:
        0 ms  _GenerateRestoreGraphProjectEntry          1 calls
        0 ms  _IsProjectRestoreSupported                 1 calls
        0 ms  _GetRestoreSettingsOverrides               1 calls
        0 ms  _GetRestoreTargetFrameworksAsItems         1 calls
        0 ms  CheckForImplicitPackageReferenceOverridesBeforeRestore   2 calls
        0 ms  _GenerateProjectRestoreGraph               1 calls
        0 ms  _GetRestoreProjectStyle                    3 calls
        0 ms  _GetRestoreSettingsPerFramework            2 calls
        1 ms  _GenerateRestoreSpecs                      1 calls
        1 ms  _GetProjectJsonPath                        3 calls
        1 ms  _GenerateRestoreProjectSpec                1 calls
        1 ms  _GenerateRestoreProjectPathWalk            1 calls
        1 ms  _GenerateRestoreProjectPathItemsPerFramework   2 calls
        3 ms  _GetRestoreTargetFrameworksOutput          1 calls
        5 ms  _GenerateProjectRestoreGraphPerFramework   2 calls
       10 ms  GetAllRuntimeIdentifiers                   3 calls
       11 ms  _LoadRestoreGraphEntryPoints               1 calls
       12 ms  _GenerateDotnetCliToolReferenceSpecs       1 calls
       45 ms  _GetRestoreSettings                        1 calls
       99 ms  _FilterRestoreGraphProjectInputItems       1 calls
      200 ms  _GenerateRestoreProjectPathItems           1 calls
      222 ms  _GetAllRestoreProjectPathItems             1 calls
      223 ms  Restore                                    1 calls
      401 ms  _GenerateRestoreDependencies               1 calls
      527 ms  PaketRestore                               3 calls
      637 ms  _GenerateRestoreGraph                      1 calls

OSX:

Target Performance Summary:
        0 ms  CheckForImplicitPackageReferenceOverridesBeforeRestore   2 calls
        0 ms  _GenerateRestoreGraphProjectEntry          1 calls
        0 ms  _GetRestoreTargetFrameworksAsItems         1 calls
        0 ms  _GetRestoreProjectStyle                    3 calls
        0 ms  _GenerateProjectRestoreGraph               1 calls
        0 ms  _GetRestoreSettingsOverrides               1 calls
        1 ms  _IsProjectRestoreSupported                 1 calls
        1 ms  _GetRestoreSettingsPerFramework            2 calls
        1 ms  _GetProjectJsonPath                        3 calls
        1 ms  _GenerateRestoreProjectPathWalk            1 calls
        1 ms  _GenerateRestoreSpecs                      1 calls
        1 ms  _GenerateRestoreProjectPathItemsPerFramework   2 calls
        2 ms  _GenerateRestoreProjectSpec                1 calls
        3 ms  GetAllRuntimeIdentifiers                   3 calls
        4 ms  _GetRestoreTargetFrameworksOutput          1 calls
        9 ms  _GenerateProjectRestoreGraphPerFramework   2 calls
       10 ms  _GenerateDotnetCliToolReferenceSpecs       1 calls
       10 ms  _LoadRestoreGraphEntryPoints               1 calls
       21 ms  _GetRestoreSettings                        1 calls
      101 ms  _FilterRestoreGraphProjectInputItems       1 calls
      209 ms  _GenerateRestoreProjectPathItems           1 calls
      218 ms  _GetAllRestoreProjectPathItems             1 calls
     1142 ms  Restore                                    1 calls
     3948 ms  _GenerateRestoreDependencies               1 calls
     5779 ms  PaketRestore                               3 calls
     5841 ms  _GenerateRestoreGraph                      1 calls

Related: fsprojects/Paket#2796

[rainersigwald]

Team triage: closing due to age. If you're still seeing this problem, please let us know and we can reactivate it.