WiFi performance

Unfortunately my router Fritzbox7362 does not support 5ghz network so I had to stick with 2.4ghz. All my other devices have a stable 45-50 mbps download and 10 for the upload but my NP seemed no to work properly in terms of download spee (youtube for instance lowers the quality according to available speed and the result is pixelated videos) ! Soo i decided to find a way to check the internet speed!

Results (if accurate-via html5 site www.bandwidthplace.com) are disappointing!!!!
2mbps download
10mbps upload

Anyone else deals with this issue????