Sophos SG 310 1Gbps bandwidth subscription Capped Internet Connection when IPS is enabled

Hello Jorge Vilbar ,

Thank you for reaching out to the community, ensure there aren't any drops on the interface/errors on the interface, try changing the negotiation speed on the interface. 
Also refer the IPS - https://support.sophos.com/support/s/article/KB-000034986?language=en_US and  Low throughput with Intrusion Prevention (IPS) - https://support.sophos.com/support/s/article/KB-000034850?language=en_US & Best practices for DNS configuration - https://support.sophos.com/support/s/article/KB-000034974?language=en_US || Sophos UTM: DNS Best Practice

Hello Jorge Vilbar ,

Thank you for reaching out to the community, ensure there aren't any drops on the interface/errors on the interface, try changing the negotiation speed on the interface. 
Also refer the IPS - https://support.sophos.com/support/s/article/KB-000034986?language=en_US and  Low throughput with Intrusion Prevention (IPS) - https://support.sophos.com/support/s/article/KB-000034850?language=en_US & Best practices for DNS configuration - https://support.sophos.com/support/s/article/KB-000034974?language=en_US || Sophos UTM: DNS Best Practice