Tutorial Gimp - Disintegration effect

Tutorial Gimp 2.8 english subtitles - Disintegration and dispersion effect - how to create an effect that disintegrates the subject of your photo in small particles like dust,
the final result can be different each time depending on the brush you use and to the distance up to which to expand the edges of the subject,
to make this effect you have to remove and change the background to separate the person from the background.

if you wanna do a test, here you can find the same picture

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[science_bogor]

When i export my photo from Gimp, and i open it on windows photo viewer and i zoom it, it always lag, can u tell me how i can fix it