[TYPO3-ttnews] Converting images

[Sergio Catala]

Hi list, 

I usually introduce images in my articles for the tt_news extension. But
I realized that generating the thumbnails for these images in the LIST
plugin element is a very slow process. I saw thumbnails are saved inside
typo3temp/pics folder. 

Could someone explain to me this process and why CPU gets so high when
using the "convert" command? Is there any way to avoid this?

Thanks in advance, 
Sergio