flum, The problem seems to be a bug somewhere in ALSA and the HDA driver. Another user reported it to me. The problem seems that µRoarD starts up with a sample rate of 44.1kHz by default. The card only supports 48kHz. ALSA is resampling and takes a lot CPU time.
I'm unsure if we can solve this in this package or if this needs to be forwarded to ALSA package (See #592911 and changelog for why). But I think the problem is already known to upstream. I'm still working on this and try to find a good solution. Thanks again for reporting this and providing all the infos :) -- Philipp. (Rah of PH2)
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