Developer DashBoard SharePoint 2010 and SharePoint 2013

There are three Modes for developer dashboard (DD)

•On: Means the dashboard starts collecting the statistics and the same is displayed at the bottom of the page(for SharePoint 2010)

•Off (default): No statistics are collected

•OnDemand: An icon is displayed at the top right corner of the page. On clicking the icon, the statistics are shown at the bottom of the page (for SharePoint 2010) or in a new window(for SharePoint 2013)

Different ways you can configure the DD

Powershell

$dd = [Microsoft.SharePoint.Administration.SPWebService]::ContentService.DeveloperDashboardSettings
$dd.DisplayLevel = 'OnDemand'
$dd.TraceEnabled = $true
$dd.Update()

Stsadm

stsadm -o setproperty -pn developer-dashboard -pv On

Object Model

SPPerformanceMonitor pm = SPFarm.Local.PerformanceMonitor;
pm.DeveloperDashboardLevel = SPPerformanceMonitoringLevel.Off;
pm.Update()