Hello :)
Thank you for your purchase <3
Your tiles are spawning slow because you are creating them in every single frame per second (so 60 tiles created per second).
If you want them to spawn immediately (instant), then you simply increase this process by using the Repeat event, I made a quick example for you in the screenshot, you can follow it.

0- Please download the extension again from its itch page to get the latest version, I released an update to include a new action you are going to need.
1- We do it as a sub-event under At the beginning of the scene condition, no need to run this in every single frame, Repeat event will already make the event run as much as we want in a single frame (which is the beginning of the scene).
2- We set the repeat number to the number of tiles you want to create, in your case:
1920/32 = 60
544/32 = 17
17*60 = 1020 (so we make the repeat event repeat 1020 times to create the entire tiles).
3- I see you set the variables FillX and FillY to 0 at the beginning of the scene, that's not required if your default variables value is 0 (set in the variables editor).
4- I see you put your conditions to increase FillY variable in a new event, that's not required as well, you can make it as a sub event just like what i did in the screenshot.
And that's it !
This will create all of your tiles and autotile them in a single frame :)
Though that single frame might freeze for a second, because you are creating and autotiling a lot of tiles at the same time, you can either cover/hide this using loading screen, or just leave it as it is, it's up to you :3


































