I mean that you should try detaching (i.e. not definig at all) the onItemUpdate callback of your NonVisualTable,
so that all streaming data are read by LS library but not processed at all;
then see if the CPU usage decreases
and, in that case, the Sync Error also disappear.
This test may not be feasible, as the overall page behavior may be altered; it depends on how your page actually works.