Powershell search millions of files as fast as possible

I once asked a similar question but in C#. Now I have the same problem in powershell..

What is the fastest way, to search files newer than 15 minutes, in a file system with more than 1 million files?

Is there any faster way than using pipe?

Get-ChildItem -Path $path -Recurse | Select Name, PSIsContainer, Directory, LastWriteTime, Length| where {($_.LastWriteTime -gt (Get-Date).AddMinutes(-15))}

I already cut off some attributes to minimize the object size. It still takes ages.

First, you don't need to call Get-Date for every file. Just call it once at the beginning:

$t = (Get-Date).AddMinutes(-15)

Get-ChildItem -Path $path -Recurse | 
    Select Name, PSIsContainer, Directory, LastWriteTime, Length | 
    where {($_.LastWriteTime -gt $t)}

That's saves about 10% (as measured by Measure-Command).

Secondly, you don't need to call Select-Object for each file either. Just change the processing order:

$t = (Get-Date).AddMinutes(-15)

Get-ChildItem -Path $path -Recurse | 
    where {($_.LastWriteTime -gt $t)} |
    Select Name, PSIsContainer, Directory, LastWriteTime, Length

Thirdly, try increasing the buffer size using the OutBuffer parameter:

$t = (Get-Date).AddMinutes(-15)

Get-ChildItem -Path $path -Recurse -OutBuffer 1000 | 
    where {($_.LastWriteTime -gt $t)} |
    Select Name, PSIsContainer, Directory, LastWriteTime, Length

I've used 1000, but you can experiment with the value.

Those three changes reduced the running time to under one half on my system.

StackExchange Code Review Q#78294, answer score: 16