Performance issues with download image


I using “Download image” for retrieve images, i got performance issues when downloading 10 images (some 3000x3000 resolution) in lapse time of 10s and (i check given more time between download with same results) , my demo freeze by one or two seconds two or three times. I think its when download the images with 3000x3000 resolution.

¿anyone known a way for avoid this?