Ubuntu gets slow when playing music

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http://askubuntu.com – I installed Ubuntu 11.10 on my Dell Inspiron 14R 3240 N4110 and everything works fine. The system runs fast, has the 3D effects animate smoothly and so on. But when I open any media player (I tried gmusicbrowser, clementine and banshee) and play some music the open programs start to freeze and the system gets slow. If I pause the playback, it gets normal again. I also tried using mplayer audio.mp3 and reinstalling Ubuntu, but the problem persists. Does it mean it is some problem with pulseaudio or alsa? If you need any additional info please let me know. Thanks in advance. (HowTos)