I use a Lumia 520. It has got 512mb RAM and I do have issues sometimes. The lag is mostly pronounced while using the Music+Videos app. When opening it, it loads for a second and then starts. When returning from the 'playing' screen to the album list, it lags. Badly. Often when I click on a song to play it, the song starts playing instantly but the 'now playing' page takes about 2-3 seconds to show up. I don't know if this is a problem of the app or a hardware limitation. Maybe it is a problem with the app itself or it might be due to 512mb ram and 1ghz processor. If anyone faces similar problem with a phone having 512mb RAM, please respond.
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