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Ironmail 6.7.2 Hotfix 8 issues

We recently installed Hotfix 8 on Ironmail 6.7.2, and are seeing a CPU performance issue. The release notes for HF8 state that the Antivirus queue needs to be in the first position, and when configure it there, we start having performance issues, where CPU utilization goes above 50% or more. Moving the AV queue to #2, and the Mail Monitoring to #1 resolves this issue, and CPU utilization is more in line with what it was before HF8.

Here's an example:


We've been running this Ironmail for more than a year now, and this is the first time we've seen the CPU utilization do this. The right side of the chart shows an attempt to put AV back to the #1 position, and then moving it to #2 after CPU utilization ramped up.

Is anyone else seeing this behavior?

A second issue we are seeing is that after HF8, it looks like the Ironmail no longer uses the swap file, which remains at 0%

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