here i edited the spectrum analyzer vis to have less bars, i haven't noticed a reduction in cpu usage, but my desktop is plenty fast. I haven't tried it on the sp13000 yet.
less bars = less getspec() calls in avs, I was hoping that would help.
Theres a bunch to try - go ahead and fiddle this a good vis to start learning avs with.
If you just want the original, with less bars use
spectrum analyzer fewbars.avs
the others i was just goofing off with, blueglow goes sorta well with lsx.
note i fiddled with these with pixel doubling on - they will look different with pixel doubling off.