VLAN trunk port IOS speed trouble

We have a problem with the internet speed on our iOS devices and Ruijie network. We use Kerio Control as our firewall, which is connected to a NBS3200-24SFP/8GT4XS switch. With Kerio Control, VLAN 9 and VLAN 19 exit from one port and go into the trunk on the switch. APs (access points) 2260 and 1200 are also installed on the switch for Dlink 2.4GHz and 5GHz testing. The APs broadcast two SSIDs (service set identifiers) from VLAN 9 and 19 and are also installed on the trunk port on the switch with VLANs 9 and 19.
On wired clients in VLAN 9, as well as WiFi Android and Windows devices, internet speed tests show 250 Mbps download and 200-220 Mbps upload. However, on iOS devices like iPhones and iPads, the download speed is 250 Mbps, but the upload speed is only 5-9 Mbps.
We have tried different AP modes, frequencies, channels, and other AP vendors, as well as disabled MAC (media access control) substitution and rotation on iPhones, but there is still no improvement in upload speed or it is still asymmetrical.. We conducted tests on the demo setup: 1. An access point connected to the Ruijie and Kerio switch without any VLAN or trunk settings provided ideal speed for iOS devices. 2. The same 2260 access point, with VLAN configuration on the SSID, connected to the Kerio VLAN 9.19 trunk without a switch, also provided excellent speed.


However, as soon as a trunk appeared on the switch where the Kerio firewall (uplink) was installed, the upload speed from iOS devices over Wi-Fi dropped significantly. We checked this on both a clean switch and a switch with IGMP settings, and we still saw the same results. Therefore, we are not sure if we are doing something wrong or if there is something else going on. We have checked different firmware versions, including the latest version, but the issue persists.


We have above 16 switches ruijie and 56 rap2260. We also tried make settings with cloud and without cloud. Cheked time, regions etc
Pls help us, we need it to solve. Also can contact via email g.gofman@atlantis-milk.ru, teatrpostman@yandex.ru