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    And thinking some more it may be that most of the...

    And thinking some more it may be that most of the time in your interrupts is register dumping and restoring - can you make the ISR just write the value to the buffer and do nothing else, without...
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    One way to debug interrupts is use a digital pin...

    One way to debug interrupts is use a digital pin (with fast writes or low-level register manipulation) so you can monitor the entry/exit using a 'scope.
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