Hello, I am trying to write a kind of parser, in which a lot of signals can be emitted and slots are called within a for loop.
my question is, how much performance/speed penalty should I expect for each signal/slot call?
Thanks
Very little within a thread. New style connections are effectively direct calls.
Across threads I imagine greater impact marshalling values.
YMMV and the best way to find out is a test with your particular arrangements to see if it will be "fast enough" (lacking something to compare against).