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hi,
the (usually blinking) "RT" means that JACK is up and running in real-time mode;

the value in percentage "%" represents the total DSP load of all active clients running under the JACK graph: theoretically, it is the fraction to the nominal period cycle time that is being consumed by processing all the current JACK participants alone; this of course refers to the machine/node on where qjackctl/JACK service is running; different machines (connected through jacktrip) may have different workloads and thus their respective %DSP loads will vary, obviously.

hth.
cheers