[ubuntu_studio] Many xruns on Ubuntu Studio 13.04 Beta on Toshiba Satellite P870

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http://ubuntuforums.org – i have Ubuntu Studio 13.04 Beta 2 on a Toshiba Satellite P870. with Jack, I get xruns at anything less than 256 frames/period (Sample Rate: 48000, Periods/Buffer: 3). Its a decently-specified machine (i7, 16Gb RAM, 1Tb HD, etc), bought two weeks go. But I'm getting better performance from less well-specified, older machines, running Ubuntu Studio 13.04 Beta 1, and Ubuntu Studio 12.04. Any suggestions to improve performance/reduce latency appreciated. (Hardware)