Activate Developer Dashboard
#If this script doesn't work, start Sharepoint Web Services application pool
#Load assemblies (if sharepoint snappin is not loaded)
[void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.Sharepoint")
[void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.Sharepoint.Administration")
#There are more options for DislpayLevel: Off, OnDemand, On
$srv = [Microsoft.SharePoint.Administration.SPWebService]::ContentService
$setting =$srv.DeveloperDashboardSettings
$setting.DisplayLevel = [Microsoft.SharePoint.Administration.SPDeveloperDashboardLevel]::OnDemand
$setting.Update()
link:
https://en.hugon.ws/articles/sharepoint-2010/using-the-developer-dashboard/