René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Quadratic behavior during tab completion","articleBody":"## Steps to reproduce\r\n\r\nOpen procmon and filter only syscall made by pwsh.exe,\r\n\r\n```powershell\r\ncd C:/a/directory/with/lots/of/files\r\ncd \u003ctab\u003e\r\n```\r\n\r\nNotice how pwsh.exe attempts to list all the files in C:/, then C:/a, then C:/directory, etc, for every directory present in C:/a/directory/with/lots/of/files. Assuming this is a pretty large directory, tab completion could take a very long time.\r\n\r\nScreenshot of procmon:\r\n![pwsh](https://user-images.githubusercontent.com/50892/90218176-04a71080-ddb8-11ea-8752-48dac97bf3ef.png)\r\n\r\nI have a feeling #12795 might be related to this issue.\r\n\r\n## Expected behavior\r\n\r\npwsh.exe should only be listing files/directory once in CWD to do the tab completion. This doesn't reproduce with PowerShell 5.1.\r\n\r\nScreenshot of procmon:\r\n![powershell](https://user-images.githubusercontent.com/50892/90218184-0a045b00-ddb8-11ea-9a16-3ceb04312256.png)\r\n\r\n## Environment data\r\n\r\n```\r\n% $PSVersionTable\r\n\r\nName                           Value\r\n----                           -----\r\nPSVersion                      7.0.3\r\nPSEdition                      Core\r\nGitCommitId                    7.0.3\r\nOS                             Microsoft Windows 10.0.19041\r\nPlatform                       Win32NT\r\nPSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}\r\nPSRemotingProtocolVersion      2.3\r\nSerializationVersion           1.1.0.1\r\nWSManStackVersion              3.0\r\n```\r\n","author":{"url":"https://github.com/xavierd","@type":"Person","name":"xavierd"},"datePublished":"2020-08-14T05:57:47.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":13},"url":"https://github.com/13432/PowerShell/issues/13432"}