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JRiver Linux 21 problems - cpu usage laggy audio multiple distros

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anton-sa:
Hi All
Im new to jriver, How i came to use jriver is that i am a keen kodi/xbmc user, however i was looking for something that can parse sacd iso's,
enter jriver linux. Oh im in the i.t industry and a linux fanatic, so dont want to run windows products. I bought and paid for jriver linux 21.

Im having the problem that when i play sacd iso's the 2ch (resampled to 192khz by way of dsp studio option in jriver) it plays perfectly,
when i switch to multi-channel album, the audio lags. during this time, i can see the cpu usage on all 4 cores well over 50%.
in 2ch mode its around 30% per core.. and no audio stutter.

Im running intel nuc5i5ryh, which is a i5 processor with upto 2.7ghz, i have 120gb kingston ssd @ over 500megabyte/second transfer rate.
I have gigabit lan, and 8gb of 1866mhz memory.

i tried copying the content to the ssd and playing it like that, no difference, so i can conclude its not the streaming causing the issue.

I played around with the BITSTREAMING option, switched it from NONE to HDMI. also no difference.

the output device via hdmi, is a rotel rsp-1572 av processor.

Linux distro wise:
ive tried
lubuntu 15.04
debian 8.1 (with and without pulseaudio)

any advice? im so keen to get my solution finalised.

Regards,
Anton

Hendrik:
multi-channel SACD is very computationally expensive to play, without having looked into the performance details of that NUC in particular, its quite possible that its beyond its capabilities of flawless playback.

anton-sa:
hi there
ok cpu usage (checked again) is between 150% and 215% (accross 4 cores, so +-53% max per core)

processor fitted to the nuc5i5ryh is : intel i5-5250u

desperate for a solution, i cannot imagine an i7 is needed?

mwillems:
You should post the JRMark of your machine (found under help-->benchmark), that might help us get a sense of what the bottleneck is.  Multi-channel DSD is very processor intensive.

One step that might help: on the top bar, there's an audio visualizer that runs while music is playing.  Try right-clicking on it and disabling it.  For some reason on the Linux version of MC it uses a surprising amount of CPU (a few percent), and if your computer is close to fast enough, removing that additional load might help.

Additionally, have you tried changing your CPU scaling governors?  Try performance instead of powersave (for example) and see if that helps.

anton-sa:
math score 1380
jrmark 2079

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