Imense FPS Drops and Stuttering when breaking/placing Blocks

Hey,

since there is no Optfine for 1.14 yet, I play without any mods/texture packs or stuff like that.

 

I have a Server with 6 Slots and 4GB of RAM. 

 

Everytime I break a block, my FPS drop down to 20-30 with imense Stuttering, from like 600 Fps I have on average. Everytime it starts to stutter, when I break or place blocks, my Chunk updates shoot up to 49-60 from previously 1-3.

Pls help me, the game is basicly unplayable like that : (.