Site Performance

Site performance can be caused due to following issues:
1) High Memory usage of a process in web servers/app server.
2) Database size.
3) Timer Job issue with any of a SharePoint server.
4) Network issue with any SharePoint server.
5) If any backup or restore is running at that moment. 6) If servers are in WAN network

PowerShell for Service Applications

Noun	Windows PowerShell Commands
SPService	Install-SPService
SPServiceInstance	Get-SPServiceInstance
	Start-SPServiceInstance
	Stop-SPServiceInstance
SPServiceApplication	Get-SPServiceApplication
	Publish-SPServiceApplication
	Remove-SPServiceApplication
	Set-SPServiceApplication
	Unpublish-SPServiceApplication
SPServiceApplicationProxy	Get-SPServiceApplicationProxy
	Remove-SPServiceApplicationProxy
SPIisWebServiceApplicationPool	Get-SPServiceApplicationPool
	New-SPServiceApplicationPool
	Remove-SPServiceApplicationPool
	Set-SPServiceApplicationPool