i have 5 decos M4 connected daisy chain. 1st, 2nd and 3rd decos are located in the main house, and the 4th and 5th decos are in the adjacent house connected via 30m CATE cable. All decos are connected via ethernet and the app has ethernet as the signal source. 

When in the main house, speed test shows 90mbps  but when i moved over to the other house, the speed dropped to 10mbps. 

Any ideas?

Thanks.