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Dramatically lower speed tests with SSL/TLS disabled

JasP

Just got 1000/100 Mbps internet installed and have been testing speeds, mostly using speedtest.net. Nothing serious, just wanted to get an idea of how the XG would hold up.

Was getting about 700 Mbps down (XG 230 50% CPU) and decided to see if I could get a full 1000 Mbps by disabling SSL/TLS scanning. I was rather confounded to see the speed drop to 200 Mbps. It made no difference if I globally turned SSL/TLS off or had an exemption rule.

I tried it again with an XG 430 and while not so dramatic, there was still a drop in speed (from about 800 to 600).

Can anybody explain what could be happening here as it is the opposite of what I would expect?



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    I've just repeated this all with an additional speed test site and the XG 430. All these tests done with Firefox as that is what I use by default and it gets the highest speeds. In the previous tests I also tried it with Chrome and the new edge but the end result was the same, slower speeds with SSL/TLS disabled.

    speedtest.net, SSL/TLS enabled 820 Mbps
    bredbånd.dk/hastighedstest SSL/TLS enabled 900 Mbps

    speedtest.net, SSL/TLS disabled 600 Mbps
    bredbånd.dk/hastighedstest SSL/TLS disabled 610 Mbps

    Both XGs are running 18.0.3 MR-3

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    I've just repeated this all with an additional speed test site and the XG 430. All these tests done with Firefox as that is what I use by default and it gets the highest speeds. In the previous tests I also tried it with Chrome and the new edge but the end result was the same, slower speeds with SSL/TLS disabled.

    speedtest.net, SSL/TLS enabled 820 Mbps
    bredbånd.dk/hastighedstest SSL/TLS enabled 900 Mbps

    speedtest.net, SSL/TLS disabled 600 Mbps
    bredbånd.dk/hastighedstest SSL/TLS disabled 610 Mbps

    Both XGs are running 18.0.3 MR-3

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