When using Get-ChildItem, the ProviderBase adds these note properties:
PSChildName
PSDrive
PSIsContainer
PSParentPath
PSPath
PSProvider
This is quite expensive, both in terms of memory and execution time.
By replacing the noteproperties with a classes that lazily can compute most of the values, we can save both storage and time.
Timing:
| Command |
6.1-preview |
After change |
Speedup |
| GCI -rec -for d:\source\powershell |
0.446 |
0.144 |
3.1 x |
| GCI -rec -for c:\windows -ea:0 |
12.24 |
6.05 |
2 x |
| GCI -rec hkcu:\ -ea:0 |
7.86 |
2.99 |
2.6 x |
Cred to @lzybkr - this was his idea, not mine.
When using
Get-ChildItem, the ProviderBase adds these note properties:This is quite expensive, both in terms of memory and execution time.
By replacing the noteproperties with a classes that lazily can compute most of the values, we can save both storage and time.
Timing:
Cred to @lzybkr - this was his idea, not mine.