Progressive slowdown



CLISP looks ok in maxima 5.20.1 :

(%i4) build_info();
Maxima version: 5.20.1
Maxima build date: 12:35 1/21/2010
Host type: i686-pc-linux-gnu
Lisp implementation type: CLISP
Lisp implementation version: 2.47 (2008-10-23) (built 3457458111) 
(memory 3473062541)

(%o4)
(%i5) while true do block([t,I,j],
   t: absolute_real_time(),
   for j: 1 step 1 thru 100 do I: integrate(log(x^2+y^2),x,0,1),
   print(absolute_real_time()-t));

19
19
19
19
19
19
18
Eric