Best guess so far: you are dumping (hundreds of)? thousands of lines into the text widget. This is what is taking time.

Sort of confirmed, instead of just 'find' try 

q( find / 2>/dev/null | perl -pe '$| = 1; select undef, undef, undef, 
+0.01' )

[download]
This feeds in the lines just a little slower :)

In reply to Re^5: Second background process is pausing the gui by tybalt89
in thread Second background process is pausing the gui by Ohad

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