This WORKS FOR ME........Try it out 
Actually, it’s an experimental feature inside YouTube app (version 5.5 and above) that loads loads much faster that the main app. If you have the latest version of the app on your phone, you can enable ExoPlayer using a little hack and enjoy faster YouTube videos streaming right away.
1- First of all, make sure that the YouTube app on your phone is up-to-date. https://play.google.com/store/apps/details?id=com.google.android.youtube
2- Now install a root file explorer app on your phone. I recommend ES File Explorer. https://play.google.com/store/apps/developer?id=ES+APP+Group
3- Also have busybox installed, open the app and install the busybox script. https://play.google.com/store/apps/developer?id=Stephen+(Stericson)
4- Okay, now open ES File Explorer and navigate to the following path: /data/data/com.google.android.youtube/shared_prefs
5- Tap and hold “youtube.xml” file and open it in editor mode.
6- Now look for “<map>” string in the XML file.
7- Now add the following lines immediately below <map>:
8- Having added the above lines, save the changes by tapping the Save button on the top bar.
9- Now exit and reboot your device.
10- When the device boots up go to Settings> Apps and tap YouTube > Force Stop button.
11- Open YouTube app
Credit: http://r3pwn.github.io/yt-exoplayer.html
DroidViews.com
Actually, it’s an experimental feature inside YouTube app (version 5.5 and above) that loads loads much faster that the main app. If you have the latest version of the app on your phone, you can enable ExoPlayer using a little hack and enjoy faster YouTube videos streaming right away.
Enabling YouTube ExoPlayer
1- First of all, make sure that the YouTube app on your phone is up-to-date. https://play.google.com/store/apps/details?id=com.google.android.youtube
2- Now install a root file explorer app on your phone. I recommend ES File Explorer. https://play.google.com/store/apps/developer?id=ES+APP+Group
3- Also have busybox installed, open the app and install the busybox script. https://play.google.com/store/apps/developer?id=Stephen+(Stericson)
4- Okay, now open ES File Explorer and navigate to the following path: /data/data/com.google.android.youtube/shared_prefs
5- Tap and hold “youtube.xml” file and open it in editor mode.
6- Now look for “<map>” string in the XML file.
7- Now add the following lines immediately below <map>:
Code:
<string name="exo_player_activation_type">ADAPTIVE</string>
<boolean name="enable_exo_cache" value="true"/>
<boolean name="show_exo_player_debug_messages" value="true"/>
9- Now exit and reboot your device.
10- When the device boots up go to Settings> Apps and tap YouTube > Force Stop button.
11- Open YouTube app
Credit: http://r3pwn.github.io/yt-exoplayer.html
DroidViews.com
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