My iphone lags when I watch youtube, skips couple seconds while i listen to music?

Ok so I don't know why but since I got the new ios 7 update, my iphone started to play funny. The other day I was playing music and I noticed that it was skipping seconds in a song in like 1/5 songs. Today on netflix and youtube, my phone starts to lag when I open either youtube or netflix. Like the video needs time so it goes back to normal. I don't know if it's the update that I should be worried about or my iphone. Btw it's an iphone 4.

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