Ubuntu 14.04 speed up wifi internet

This quick tip will show you how to speed up your wireless internet in Ubuntu 14.04 Trusty by disabling the power management for the wireless chipset.
For most wireless chipsets, a simple tweak on disabling the power management is sufficient for increasing the speed and the connection quality of your wireless internet. The price you pay is obviously an increase in power consumption, although this increase isn’t much.

To get started, press Ctrl+Alt+T to open a terminal window. When it opens, run:

iwconfig

You’ll see something like this, which mean your wireless device is wlan0 and power management is on. When it’s off, or when no mention is made of Power Management at all, you obviously don’t need to do anything.

ppp0 no wireless extensions.

eth0 no wireless extensions.

lo no wireless extensions.

wlan0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=19 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:on

To disable Power Management, run command to edit config file:

sudo nano /etc/pm/power.d/wireless

Copy and paste below into the empty file and save it. You may change wlan0 to your wireless device name.

#!/bin/sh
/sbin/iwconfig wlan0 power off

Change the permission:

sudo chmod 755 /etc/pm/power.d/wireless

Reboot your machine and done.

source: ubuntuguide.net

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