[MC-263882] TNT performs raycast check for fall damage

If a TnT entity has -y motion, it will perform a raycast on movement which is usually utilised for entities to calculate their accumulated fall damage, however this check is not necessary for TnT which is unaffected by fall damage. This raycast produces severe performance issues in TnT projectiles travelling at high speeds as the raycast will be projected over a very long distance for each tick the TnT moves despite achieving nothing.

The relevant code can be found in Entity.java

[media]

Linked issues

relates to 1

MC-260743 Entities perform insanely redundant collision checks on motion Reopened

Comments 2

user-f2760 2023-06-27T19:14:46Z

Mind telling where in the code this can be found?
Is TNT the only non-living entity with this check?

Comedy 2023-06-28T00:03:26Z

this can be found in entity.class in the code and its a thing for every entity that uses regular move method. This was also something that wasnt added into code until 1.18 and leads to huge lag when moving entities at high speeds.