Why won't my iphone play GIF's/Videos right?

I own an iPhone 4s and recently updated to iOS 7, however, although in good condition and memory space; it won't play videos correctly (laggy) on 9gag, vine, YouTube etc. The only place it will work is safari for some reason. I have tried re-downloading the apps and it makes no sense because I've had it in worse conditions when it had iOS 6, yet it worked fine.

Make a backup of your files, photos, music, anything.
maybe it is bloated with temporal files, then restore it and will work again fine

  • YouTube videos won't play on iPhone? YouTube videos won't play. It just keeps loading. And also my safari and mail won't work as well. Whenever I go into safari it just flashes out. And when I go to mail it's just frozen and it flashes out after a while. If anyone knows how to fix this please tell me how? That would be a great help.
  • Why won't vine videos on my iphone load or play? I have tried uninstalling and everything and logging out and it just shows the picture It hasn't been fixed yet anyone know how to fix it?
  • Why won't YouTube won't play videos on my iPhone? My phone randomly stopped playing YouTube videos. It just shows that it is loading and never play. I have great Wi-Fi connection. Every other app including Netflix runs smoothly. It doesn't work on the app or browser. I cleared the cache on my browser. I reset my phone. My phone and the app are updated completely. I have no idea what to do.
  • Why won't songs play good on my iPhone 5 but play normal on iTunes? When I download music and import it to iTunes, They play fine and normal but as soon as i put them on my iPhone they sound scratchy or like if they were getting fast forwarded. I don't think it's my iPhone because I've put songs in it before but this just started happening today. What's the problem, How do i fix this?