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Network performance degradation may be attributed to the Intrusion Prevention component of Symantec Endpoint Protection version 14.3
Article ID: 195141
You notice network performance degradation when the Intrusion Prevention component (IPS/CIDS) is installed on high-activity servers running Symantec Endpoint Protection (SEP) version 14.3.
An engine update will be released in the future via LiveUpdate that will resolve this issue.