Not sure what exactly you mean by "slow and fragmented" (I haven't run your program), but if it's updating in about 1 sec intervals, you could try to reduce the sleep interval of tail, for example to 0.1 sec 

-s, --sleep-interval=S
    with -f, sleep for approximately S seconds (default 1.0) between i
+terations.

[download]

Just an idea.

In reply to Re: Realtime update of a textbuffer from STDOUT/STDERR in Gtk2 by almut
in thread Realtime update of a textbuffer from STDOUT/STDERR in Gtk2 by fang0654

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