René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Performance problem: -Name slows down Get-ChildItem -Recurse","articleBody":"`-Name` is a convenient switch to only output item _names_  (without `-Recurse`) or _relative paths_ (with `-Recurse`).\r\n\r\nGiven that only _string_ instances rather than `System.IO.File/DirectoryInfo` instances are output, one would expect `-Name` to speed things up (or at least not to slow things down); however, with `-Recurse` present, `-Name` _slows down_ the command noticeably.\r\n\r\n# Steps to reproduce (on Windows)\r\n\r\n```powershell\r\n# Warm up the cache\r\n$null = Get-ChildItem -Recurse 'C:\\Program Files' \r\n\r\n# Without -Name\r\n(Measure-Command { Get-ChildItem -Recurse 'C:\\Program Files' }).TotalSeconds\r\n\r\n# With -Name\r\n(Measure-Command { Get-ChildItem -Name -Recurse 'C:\\Program Files' }).TotalSeconds\r\n```\r\n\r\n# Expected behavior\r\n\r\nThe command with `-Name` should be faster (or at least not slower).\r\n\r\n# Actual behavior\r\n\r\nSample timings:\r\n\r\n```none\r\n1.544098   # without -Name\r\n4.5759553  # with -Name\r\n```\r\n\r\nThat is, adding `-Name` made the command about 3 times _slower_.\r\n\r\n# Environment data\r\n\r\n```none\r\nPowerShell Core 6.2.0-preview.4\r\n```\r\n","author":{"url":"https://github.com/mklement0","@type":"Person","name":"mklement0"},"datePublished":"2019-03-11T18:46:22.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/9119/PowerShell/issues/9119"}