Cheats causing low fps?

Why does using cheats cause a lower fps? For example, currently playing pokemon sun randomized nuzlocke, i tried to use the no lines cheat since i cant find the code to replace to remove the lines, and i sit at about 45fps instead of a smooth 60, i decided to test this with another cheat and it seems that any cheat causes the games fps to drop its not just the no lines cheat. Why does this happen? im trying to use the rebattle trainers cheat to get good EXP and cut down on grinding times for new pokemon but i
just cant deal with the fps this low

Also, is there any way to get online any more? I found a steelix as one of my first encounters right at the beginning of the game and unless i can get online theres no way to get a mega steelix since you need to redeem a code to get the steelixite.

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