[Solved] After flashing OpenWrt slow speeds [Solved]

Hi, so after I installed OpenWrt on my XR500 with this firmware 22.03.0-rc6 (r19590-042d558536) I noticed that my download speeds are more than halfed! From 930Mbps to ~300Mbps. I have leaved everything on default so far. My setup looks like this. Cable Modem/Router -> XR500 -> PC. With stock firmware I got full speeds even with qos. Can I get this solved?
devices

iperf3

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Hey, after enabling software and hardware offloading and disabling ipv6 I achive speeds up to 600-800Mbps.