Major lag and Freezing of game for 5 minutes one after the other

Experiencing major lag and game seems to freeze for a time frame of up to 5 minutes before unfreezing and then the cycle starts over again. I know on switch there is a 2Gb game size which I’m very close to. This itself is a major floor. Game also doesn’t load chucks very quickly. If I’m travel by horse I have to wait 5 minutes before each chuck loads in. The game is very much impossible to play as it’s stopping every other minute.