JPEG Compression using blockproc is taking so long time when I run it?

I am doing a JPEG compression on an image.. I used blockproc function to perform the DCT and The quantization, however when I run the code, it is taking sooo long the block processing just to show some results why it is taking that long to run

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Asked:

on 9 Jan 2017

Edited:

on 9 Jan 2017

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