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poor efficiency of Numerical Integration at 5.2.0 ?


My system is Mandriva 2007 on K7 sempron 2500+ and I has ram about
512MB.

1.
http://amd.streamload.com/sombrazorro/Hosted/z_Ds_tau_test.nb

When calculating ZmDsTau[1000,1.7] and plotting ZmDsTau[en,1.7] in
z_Ds_tau_test.nb, it took 138 secs and 2.3 hrs on 5.2 respectly.
But in 5.0.0 it took only abot 1.5 secs and 73 secs.

2.
http://amd.streamload.com/sombrazorro/Hosted/testbug.nb
At version 5.2.0, it caused memory leakage   (needed about 500 MB and
above) and I can not got /sigma[1].
Finally, process manager killed the process.
Then I got /sigma[1] in 1 secs at Version 5.0.0 .

Does Anybody get the same problem?
Thanks.



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