large amounts of server lag in singleplayer near village

I'm getting huge amounts of server lag in my singleplayer village, and it's at its worst when night comes around and the villagers all start scrambling to go home. I used the /debug command when it started getting pretty bad, but I'm not sure what other information you might need for this, so please tell me and I'll give you what I can.

 

I should have mentioned this earlier, but this isn't an untouched village. I've built plenty of new buildings, and there is a lot of villagers running around. Despite this however, I didn't get the singleplayer server lag in 1.14. It only started occurring once I upgraded to 1.15+.

 

Examples of negative affects as a result: Mobs start stuttering and keep jumping forward, the sun is constantly jerking backwards, eating a single piece of food takes several seconds. Block breaking itself is **mostly unaffected, but the camera occasionally stutters when breaking blocks, and picking up dropped items takes longer than it should.