Is it connected wirelessly? If it is, try moving it closer to your router.
On a side note, I wouldn't trust the results of the PS4 speed test, my PS3 shows half of what my PC gets, even though both are connected with an Ethernet cable.
Are you using a wireless connection on the PS4? (aka wifi)
If so, that is the reason, if not I shall ask you to live with it, and think about the fact that 2 weeks ago my internet connection maxed out at 300kbps (35KBps). Be happy with 20mbps.
Is it connected wirelessly? If it is, try moving it closer to your router.
On a side note, I wouldn't trust the results of the PS4 speed test, my PS3 shows half of what my PC gets, even though both are connected with an Ethernet cable.