As you say, you are using exactly the same script for 2.49 as 2.59
NO! I am using different scripts ! I use the script for 2.49 with Blender 2.49, and the addon made by yoyoz for 2.59 with Blender 2.59.
I haven't tried but Lionel's addons is not made for 2.49.
I said I used the same settings
in both scripts, not the same script. And yes, I use the same blend file.
I checked with other blend files with same result : more than twice the time with the addon for blender 2.59.
One thing that I have not tried is to use the old script for 2.49 with Blender 2.59. I haven't tried because I fear that relinking an obj file made with an other exporter could lead to a corrupted ocs...
French Blender user - CPU : intel Quad QX9650 at 3GHz - 8GB of RAM - Windows 7 Pro 64 bits. Display GPU : GeForce GTX 480 (2 Samsung 2443BW-1920x1600 monitors). External GPUs : two EVGA GTX 580 3GB in a Cubix GPU-Xpander Pro 2. NVidia Driver : 368.22.