Ubuntu: video lag

[romangaag]

Hello everyone! Ubuntu version from 20160421 installed ok, but had several problems:
1. System lags (but not critical)
2. Ragged sound (youtube, video from sd card)
3. Video lags (youtube, video from sd card)

After installing Ubuntu 20160501 2 problems still alive:
1. System lags (still not critical)
2. Video lags (youtube, video from sd card) - impossible to see anything. 

Tried to watch video from youtube at 240 p - lags. 

VLC plays video with lags.
Suddenly GNome Player plays videos ok but no way possible to set the full screen: player goes full screen but the videos still very small. 
Can anyone help, please? 

p.s. Ubuntu very-very noob user.

[tkaiser]

1. System lags (but not critical)

You get the reason for free by executing this:

Code:

sudo apt-get install iozone3
iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2

[romangaag]

ubuntu@localhost:~$ sudo apt-get install iozone3
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

[Beryllium]

If you want better youtube video playback install Remix OS or Android, and install youtube app, don't use web browser for video watching.

[romangaag]

If you want better youtube video playback install Remix OS or Android, and install youtube app, don't use web browser for video watching.

RemixOS works very slow and unstable for some reason.