We have a virtual UTM 9 used as a WAF in front of a relatively high trafic website (100k to 400k visits per day).
The UTM9 is processing the https and act as a WAF for the website.
Our UTM is in v9.4 because we had to downgrade it from 9.5 due to a bug on the network interface.
During load and performance testing, we noted a very high CPU load on the virtual machine hosting the UTM9, with performance significantly slowing down. It seems the UTM9 is reaching its limits and become a bootleneck.
We tried to get sizing guidelines from Sophos, no clear answer (if any), and we couldn't find anywhere a précise documentation on the subject for the virtual UTM.
Has anyone experienced a similar situation ?
Any recommandation on sizing guidelines ?
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