Enable Developer Dashboard in SharePoint 2010

In SharePoint 2007, its very difficult to understand the performance or page delay, SharePoint 2010 offer new feature with the name of developer Dash Board, its very use-full to understand whats exactly going on.

using developer Dash Board you can view information such as

• Thread execution time
• Number, duration, call stack information and query text of each SQL Server query generated by the page
• Number, duration, and call stack information of each WCF call
• URL or timer job name
• Current user
• Execution start time
• Any of the preceding statistics for code enclosed by SPMonitoredScope
  

How to Enable Developer Dash Board using PowerShell.
Developer Dash Board have 2 modes

1. On (it Display on every page)
2. OnDemand (it display information on demand , you can use icon along login user name.)

open sharepoint 2010 powershell and write below script in it. you can change the value of On and OnDemand from 3 line.

$contentService =[Microsoft.SharePoint.Administration.SPWebService]::ContentService
$dashboardSetting = $contentService.DeveloperDashboardSettings
$dashboardSetting.DisplayLevel =[Microsoft.SharePoint.Administration.SPDeveloperDashboardLevel]::On
$dashboardSetting.Update()

You can user icon to open Dash board:

Developer Dash board Will display at bottom of the page, which looks like as