Xiaomi AX3600 software vlan concern, DSA, questions and confusing problem

Hardware Questions and Recommendations
1

Hi, I did mwan3 setup with this router but I have some questions.
I will start with this I haven't flashed routers since around ~18, 19 openwrt release.
And see that there new things like DSA i dont know. Also the switch menu is gone.
I need to isolate one of the LAN ports to be second WAN and did it this way:

config bridge-vlan                                  
        option device 'br-lan'                      
        option vlan '1'                             
        list ports 'lan1:u*'                        
        list ports 'lan2:u*'          
                                      
config bridge-vlan                                  
        option device 'br-lan'        
        option vlan '20'              
        list ports 'lan3:u*'

it works OK but this is software based ? <-- 1st question
If it is, is it something to concern or worry about for home setup with 3-4 clients?
Can I make the 3rd LAN 2nd WAN without using VLANs like detach from the bridge and add new interface assigned to lan3 ?
Should I use "software offload" ? And should I use it with "hardware offload" ?

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I will buy one more router and Im wondering between this and AX3200
this has better hardware per my vision but I dont know whether DSA will be supported in future? its important to me
It seems (at least at first sight) that AX3200 switch is supported.
I like AX3600 is atheros based and have more RAM and big heatsinking.
AX3200's 256 ram enough?
Mediatek good as atheros?

What do you recommend to me :slight_smile:

I see some cpu usage when do speedtest.net

2

The ax3600 (ipq8071a) does not use DSA, it just looks a bit like it (but isn't underneath) - chances for proper network/ switch drivers are non-zero, but very low (and would take years). At this point, filogic 830 based devices probably provide the best mixture of features and performance.