Command discovery on systems with symlinks to slow filesystems is slow #6577
Description
Not all commands. ls takes 20 seconds. dir is nearly instant. This is just the simplest example, but the overall experience makes me want to stop using powershell on Linux. :-( Tab completion also takes around 20 seconds.
Steps to reproduce
PS > measure-command { ls }
Days : 0
Hours : 0
Minutes : 0
Seconds : 20
Milliseconds : 25
Ticks : 200252179
TotalDays : 0.000231773355324074
TotalHours : 0.00556256052777778
TotalMinutes : 0.333753631666667
TotalSeconds : 20.0252179
TotalMilliseconds : 20025.2179
PS > measure-command { dir }
Days : 0
Hours : 0
Minutes : 0
Seconds : 0
Milliseconds : 3
Ticks : 33095
TotalDays : 3.83043981481481E-08
TotalHours : 9.19305555555556E-07
TotalMinutes : 5.51583333333333E-05
TotalSeconds : 0.0033095
TotalMilliseconds : 3.3095
Expected behavior
ls takes a second or so.
Actual behavior
ls takes 20 seconds.
Environment data
> $PSVersionTable
Name Value
---- -----
PSVersion 6.1.0-preview.1
PSEdition Core
GitCommitId v6.1.0-preview.1
OS Linux 4.9.0-6-amd64 #1 SMP Debian 4.9.82-1+deb9u3 (2018-03-02)
Platform Unix
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0Metadata
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