I have cheats enabled and I used / locate stronghold, I was then teleported above one that was in the ocean. once I dug down into the stronghold area, I would get really bad lag spikes to the point where the game completely crashes. I have tried debugging the world and also optimized it a few times to see if it will help but it still has issues in that stronghold. At my base and everywhere else in the world seems to be perfectly fine, just in that stronghold that I am having some issues.

I was able to fix this issue. I just had to allocate more RAM to the world after watching live game data and noticing the 2GB of RAM wasn't enough for my world so I had changed it to 5GB and now it runs like butter.