Hi, thanks for the bug report.
The cause I believe is that synaptic sends a storm of AT-SPI focus events when 
updating the package view. It seems to generate at least one event for each 
added line. Onboard, with auto-show enabled, has no choice but to receive each 
and every one of them. I found it is enough to stay subscribed to this event, 
so even if no actual processing is done in Onboard, the act of receiving is 
enough to ramp up CPU use and stall synaptic's startup.

I think what we need to do is look at why filling synaptic's package
view triggers those events. I don't see how to work around this in
Onboard, apart from turning auto-show and word suggestions off.

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https://bugs.launchpad.net/bugs/1264315

Title:
  Interaction with onboard causes synaptic to become unresponsive

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