High Memory and CPU usage on Sitecore 8.1-update-3

We have successfully upgraded website from Sitecore 7.1 to Sitecore 8.1 update-3. After upgradation of our website, we started weird behavior that application was consuming high memory and CPU utilization and many times site was not responsive while on heavy load. Site was not responding atleast to 4-8 minutes or have to restart the application (AppPool). After analyzing Sitecore have given patch to resolve this and it was already fixed in Sitecore 8.2 version.

EventQueue AddCriteria and GetEventTypeConditions methods build an incorrect sql query clause

Regards,

Trilok

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