SharePoint trouble shooting - update list data without event receiver triggered in powershell

Sometimes we need to run powershell to do batch update some list items, if the event receiver is active, the update process can be very slow. In this case, we will want to turn it off before batch update, then turn it back on.

Here is the powershell script to complete this,

# disable event firing
$my = [Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint");
$type = $my.GetType("Microsoft.SharePoint.SPEventManager");
$prop = $type.GetProperty([string]"EventFiringDisabled",[System.Reflection.BindingFlags] ([System.Reflection.BindingFlags]::NonPublic -bor [System.Reflection.BindingFlags]::Static));
$prop.SetValue($null, $true, $null);
**** run times update ****

# enable event firing
$prop.SetValue($null, $false, $null);