Version Information

Minecraft version: 1.12.2
Forge version: 14.23.5.2859
Other mods (if applicable): dynamic trees

Steps to reproduce:

1. play the game
2. delay
3. crash sometimes

Expected Behavior: i dont know

Actual Behavior: lag

Link to crash log (if applicable - use a site such as hastebin:

and Terrarium!

The crash log links to the hastebin homepage, could you link the actual crash report?