I have a dell gaming( i5577-7359BLK-PUS) with the following info

uname -a
Linux devgamer 4.16.18-041618-generic #201806252030 SMP Tue Jun 26 00:33:13 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

rfkill list all
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no

dmesg | grep iwl

The connection slow is 50% or less than others devices included the same laptop when is booted on windows, my provider gave 500Mbs/20Mbs and the for speed for the laptop on Linux is 150Mbs/17Mbs.

I would appreciate a lot their advices and where should I check to fix that.

PD: The rest of my devices MBP, Android tables/phones) gave me 400Mbs/18Mbs in the speedtest I do.