PPPoE very slow with Sophos XG Firewall

sorry, unfortunately no solution for me.
I did an update on the FritzBox 7490 to the brand-new firmware 06.50. Then did setup the 1&1 dsl internet connection over FritzBox (without XG Firewall) to see whether the dsl-connection generally is fine. Result: Everything is OK: DSL-Connection with full VDSL-100 power. So there is no generally problem with the FritzBox and behind.
After that i did a factory reset on FritzBox and changed the cable installation back to the config "XG Firewall with FritzBox as DSL-modem".
Set MTU to 1492 and MSS to 1444 on XG Firewall and connected over PPPoE.
And, ahhhhh, still the same problem!: Speed not over 2.5 Mbps.
Other solution tips?

Try looking for your QOS settings, might have been accidentally changed to a lower value.

Ian

i have checked this: QoS settings are ok
still at a snail's pace, 2.5 Mbps.
Even if i disable all scanning settings there is no higher speed.

Hi,
what we have't discussed is your hardware eg cpu, memory, NICs and disk space?

Hi,
what we have't discussed is your hardware eg cpu, memory, NICs and disk space?

i have:
- Mainboard Gigabyte GA-Q87TN (with 2x LAN on Mainbord -- 1x 1 GBits Intel -- 1x 1 GBits Realtek)
- Intel Core i3-4130T -- 2,90 -- 2 CPU cores
- 8 GB RAM SO-DIMM DDR3 1600 MHz
- 64 GB SSD SanDisk X110, SATA 3

I have had a look at the MB specs and it isn't specific about which intel or realtek chip it uses. One of the intel chips does have a problem with the driver used in the UTM, but I suspect t hat is not an issue with the XG.The XG does seem to run new drivers and not some much backward compatible stuff.
Do you have access to a new dual NIC (Intel, Broadcom) to try out?

Hello, thanks for the support. But i can not replace the NIC. it is an Aquado Slim PC and i can not plug in other NICs. I tried to change the assignment of the Ports. So Port1 and Port2 ist now changed concerning LAN and WAN. But no sign of recovery