Using Get-WinEvent with Hashtable instead of Get-Eventlog increases performance about css-exchange HOT 5 CLOSED

PS C:\>  Get-WinEvent -FilterHashtable @{LogName='Application'; ProviderName='MSExchange Unified Messaging'; Level='2'} | Where-Object { $_.Message -like "*System.InvalidCastException*"}
Get-WinEvent : No events were found that match the specified selection criteria.
At line:1 char:2
+  Get-WinEvent -FilterHashtable @{LogName='Application'; ProviderName= ...
+  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (:) [Get-WinEvent], Exception
    + FullyQualifiedErrorId : NoMatchingEventsFound,Microsoft.PowerShell.Commands.GetWinEventCommand