EX3110 Slow Speed

What router are you running off? 

The EX3110 has the potential for a 300mbps link speed over 2.4ghz. That's link speed. Link speed isn't the same as throughput*. 

You're link speed it 39 mbps. 

The other thing I notice is the 5ghz isn't connected.  5ghz is much much faster thatn 2.4ghz but doesn't broadcast as far or through as much materials. 

these 2 things make me think that either you're to far away from the router or your have to many obstructions in the way. 

*throughput is actual speed. It is usually 55-65% from a router.

Its even worse off an extender because of the very nature of how they have to work. Reason why is an extender has to recieve from the router and then rebroadcast to devices using the same chip and it can't do both at the same time. This cuts its speed in half of what its getting from the router. 

so if you're already at such a weak link speed (39mbps) back to the router and you add in the throughput hit it takes, you're speeds could be what you'd expect. 

Things you can try? 

1. move it closer. If you're 5ghz isn't even linking because of distance/obstruction, then you're to far away. 

2. move it laterally. If its obstructions in the walls, sometimes a lateral move can help. 

3. try changing wifi channels. maybe the one you're on has interference. Potentially changing which channel you're broadcasting on can help with interference

what is your interior home walls made of? 

How far apart is the router from the extender? 

Router you're using?