A 3-5 second freeze/pause every 1 minute of playing

I started playing Minecraft again recently and I downloaded it from the appstore, but the game keeps freezing/pausing for 3-5 seconds. The game runs fine at first, but then the screen starts freezing after a few seconds, and it keeps happening until the game eventually crashes. I've only installed a few add-ons like Actions&Stuff, RealismCraft, and 3 more.