My EX6200 its just... ridiculus

firmware: V1.0.3.74_1.1.109

whats going on with it? i pay for a good extender and i have crap..  its just ridiculus i use as extender 2.4G to 2,4 and 5G extender... i made a speedtest near to router with my mobile with (speedtest) and i get 20mbs from the original signal... so i conect my ex6200 to wifi and i made the test with extended signal and i get..... 3MBs per second.

i test it with laptop and mobile but its ridiculus.. 2.4g an 5g wifis both same speed. ¿what i do with it?