Since 1.13.2 the rate of ms is extremely high when flying with elytras, in this 1.14.1 the problem does not improve and it follows in the same way.
The error generates such a degree of increase of ms that it makes impossible the exploration with elytras.
I take this opportunity to inform that it also happens peaks of lag when randomly "as if it were server" when interacting with a block and it takes to return item. Example:
When breaking a block it takes a few seconds to become items or failing to generate a peak of lag.

I attached a video in which we can better appreciate the problem.

https://youtu.be/7diYEM5t_po