Relic Castle

Hello!
First, sorry for my English.

First problem:

Doing my fangame in RPG Maker XP with the base Pokémon Essentials 17.2 I notice a few pauses when my character walks (about 0.3 ms).
My FPS works perfectly, but those pauses are uncomfortable to look at.

I don'tt think it's a problem to use large maps (since it happens to me on small maps without events).

It's not a problem of the day / night, since it keeps happening even if I deactivate it.
I have seen that many people have this problem in their own fangames, but I don't know what exactly cause that problem.

I put an capture for you to see what I mean, but not so appreciated when doing the gif:


It also happens to me in version 17 vanilla, however, it doesn't happen to me in version 16.

EDIT: Of course, I have this check it:
Second problem:

I also have a problem with tearing at the top of the game screen when im walking. I guess it's because of the number of pixels that are used in Pokémon, but I don't know how to solve it. Here the image with the problem (I use base size, 512x384):


Thank you so much!