dblquad issues for 3.2.4 and 3.6.3

[twinclouds]

Hi,
I recently have some needs for 2D integration.  I used a square to
approximate an infinite plane.  When I use Octave 3.2.4 on Ubuntu 10.04, it
works pretty fast but overflew when the square become too large.  I tried
the latest Octave 3.6.3, if does not have this problem but the speed is
greatly reduced, even for the same region that 3.2.4 worked.  The speed
difference is quite large, even up to a hundred times (a few seconds vs. a
few minutes).  Does anyone know why and has a solution?  I would really
appreciate your input.
The scripts that I used are pretty simple.  The main one is testCM16.m the
function m files are mi0.m, mi16.m and cm16.m as attached.
testCM16.zip
<http://octave.1599824.n4.nabble.com/file/n4648989/testCM16.zip>  
Thanks in advance.



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