OpenWrt 22.03.3 third service release

I am replacing a Linksys MR8300 ( ipq40xx) with a Linksys ea7300v2 (MediaTek MT7621AT).
I installed the new 22.03.3, on the B partition, reinstalled the software and everything worked...before I tested the wifi.
On the MR8300 my wifi was 200 Down and 30 up, with this new one:
-Linksys FW V2.0.4.208179 I see 200 Down and 30 up
-Openwrt 22.03.3 I see 1.5 Down and 10 up???

I tested other settings and then I see the device showing available bandwidth on the device up to 450 Mbps but the test confirm this ( as browsing, and watching videos).

Anything I need to install or change in this model?

Any suggestion is appreciated.

UPDATE: I see here lots of people have issues with this chip OpenWrt on MT7621/MT7615N devices with 5GHz problems - #236 by alcazaurus also a lot of routers have this chipset...

I will test without the 5GHz and see...

UPDATE 2: disabling 5GHz I get 20 Mpbs...not great...better of before