User blog:Cure kitty mew/Editing Troubles

So, I've been on this wiki a lot lately, and I really enjoy editing on this. But when I edited Hana Daidaiyama's page, my computer went really, REALLY slow, to the point where it took 6 seconds for my computer to take in each letter. And I'm not exaggerating. I also tried to add an illustration picture to Osana Najimi's page, but that messed the whole gallery up. Can someone please teach me to edit a gallery? I added a picture before successfully on a different wiki, but I forgot how I did it.