Run the PowerShell script below

$f = Get-SPInfoPathFormsService
$f.Properties.Add(“AllowEventPropagation”, $false)
$f.Update()

References:

https://social.technet.microsoft.com/Forums/windows/en-US/a07c045d-0930-4d04-bea6-de0f16889096/sharepoint-2013-sp1-very-very-slow-performance-of-infopath-list-with-data-connection?forum=sharepointadmin

https://support.microsoft.com/kb/2775306?wa=wsignin1.0​​

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