i think my computer is slowing down

so heres how it started. i downloaded a bunch of things i liked, and then i went to play a roblox game called bus. (beat up simulator) i was just on my samsung galaxy a10 while the roblox game was still running, and for an minute, it starts to lag and make the fps go slow, like the fps was 10, 11, 13, idk. and i thought to my head: ''what?? how is it slowing down???'' and then i realized it was probably of the gifs and pictures i downloaded, i wanted to put them in the garbage bin, but i dont wanna do that and clear it, because those things i downloaded we're my favorite. (i did not download any innapropiate things, i just downloaded some aesthetic gifs, images, etc....) so uhm yeah. just an dumb story that happend today. and yes i downloaded A BUNCH of gifs and images. like i said again, i did not download any innapropiate gifs, or pics, etc. i started downloading from an day ago, i forgot which day it was. probably the 20th day or the 21th day idek