Intriguing, I never saw this kind of problem…

Could you check whether it's CPU bound, e.g. does Geany use a lot of CPU when the letters appear? Also, does e.g. scrolling in a file, or open one, show the same kind of lags?
If so, maybe you could try and get a backtrace during the lag, by running Geany inside GDB and hitting Ctrl+C while it's lagging, and getting a backtrace there? it might need a few tries to get a meaningful backtrace, but it could potentially show where the slow code lies.

Also, could you post the debugging info from Help → Debug Messages?

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