Minecarts acceleration feels so slowly unlike before 1.14 also the max speed on normal rails is super slow unlike in versions before 1.14 Video about the bug - https://www.youtube.com/watch?v=cS1YovUiVlM
Linked issues
is duplicated by 1
Comments 5

Video about the bug - https://www.youtube.com/watch?v=cS1YovUiVlM

The client, launcher, the server you are playing with is modified.
Issues with mods or plugins need to be taken up with their authors. If you can reproduce this issue in a vanilla environment, please let us know and we will reopen this ticket.
The only mod is Optifine (for the shaders) and this is a vanilla issue
Experiencing same issue on version 1.14.4
Can you elaborate on this? Can you post videos comparing this behavior?