Since march of this year (2019) our customer is experiencing extensive performance loss due to the AMP process. We have noticed that at the beginning of a WCF server call the AMP service ( epsecurityservice.exe) becomes very active (50-80% CPU) for quite a long time (30-90 seconds). We don't receive an answer from the WCF-service during that time. When we shutdown the virusscanner on the client we can see some improvements (20-30 seconds). Shutting down the virusscanner on both the client and server will give us the expected response time (less than 1 second). Excluding the server and client process will help some, but still doesn't give us the expected response. The WCF service is using a custom Binding with binaryMessageEncoding and compression using GZip on net.tcp (port 8733). Our questions: What is causing this, and why didn't it cause any problems before? What is the preferred solution?
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