We have exactly the same issue (EFSW 7.1.12006 and 7.1.12008 on Server 2016).
We contacted ESET Support a long time ago but they were unable to help. Installing EFSW without network protection makes a bit of a difference, however, in order to get the full performance, we would have to remove EFSW completely. This problem does not occur with Windows Defender or other AV-solutions.
Does anyone here have any further information or advice how to proceed? We would like to make use of network protection and get the full performance. I will test the pre-release update channel and will report back in the interim.