Documenting CPU for running process - powershell

Question

Ref. http://powershell.com/cs/blogs/tips/archive/2013/04/16/documenting-cpu-load-for-running-processes.aspx
This PowerShell code runs great locally, but when changing it to remote computer, it does not work.. I would also think it be helpful to add not only CPU Usage, but memory as well.
$CPUPercent = #{
Name = 'CPUPercent'
Expression = {
$TotalSec = (New-TimeSpan -Start $_.StartTime).TotalSeconds
[Math]::Round( ($_.CPU * 100 / $TotalSec), 2)
}
}
Get-Process -computername RemoteServer |
Select-Object -Property Name, CPU, $CPUPercent, Description |
Sort-Object -Property CPUPercent -Descending |
Select-Object -First 4
And, shows for the results:
Name CPU
CPUPercent Description
---- --- ---------- ----------- svchost
sysedge
svchost
svchost
Changing it back to local run, we see:
Name
CPU CPUPercent Description
---- --- ---------- -----------
powershell_ise 5.578125 0.51 Windows PowerShell ISE
Application 2634.765625 0.24 Some Agent Executable
svchost 1926.96875 0.18 Generic Host Process for Win32 Services
mcshield 1903.875 0.17 McAfee On-Access Scanner service