JAI runs out of heap when resizing big images, Java2D not

Hello,
I was doing some tests wit PMIW library (which wraps both Java2D and JAI) and it seems Java2D is much faster and doesnt eats as much memory as JAI (I have tested the native version only).
Do you have a clue why?
Thanks

Correction: I have testet non-native version only (the pure-java one).
The test was simple: resize large images (thousands of pixels in width and height).

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