Why does snapchat take forever to load?

I have the galaxy 7 and snapchat stories don't load on my Wi-Fi but with data it loads quick. My girlfriend has the galaxy 6 and my cousin has an iphone, they are both on my Wi-Fi also and it loads quick. Is there anything I can do to make it faster?
Btw even when IIm alone on my Wi-Fi it takes forever.

May be you need more space

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