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SharePoint 2013. 3 WFE, 2 App and 1 DB Server.

All of the sudden sites are super slow. What area should I look (beside logs)

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    Is a full crawl running? Check Database activity. – Bunzab Jul 26 '16 at 20:13
  • Does the logs show anything? – David Jenkins Jul 26 '16 at 21:14
  • check the database server. we had the same problem a couple of months ago and the db server cpu was %100, had to failover. – ova Jul 27 '16 at 7:52
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There too many reasons for this, you can check following things

  • try to browse the sites directly bypassing the load balancer(using host file entry)
  • check the cou and memory usage on the sharepoint server and database server
  • check if there is any deadlock on db server
  • look for throttling error in logs
  • if you have antivirus installed on server check if that is blocking or slow down the things
  • check ups logs for clue
  • search crawls also cause the issue
  • network connectivity also cause the issue
  • check event logs
  • check the status of database from central admin
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Other area you could validate to identify where the problem might be -

1.How is your Database server performing.

  1. Is there a connectivity issue between the WFE's and the DB

  2. If the performance problem are being reported by end users? Validating the site performance from the WFE's itself might be a quick test to eliminate the possibility of end user n/w issue.

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