Hi LeBron James,

It's hard to say why uploading to the cloud is slow, most people choose to use the desktop modeler and run locally unless they need to test something in a cloud enviroment.

what is it you are trying to create?

If you are interested in custom styling, you should check out:
https://medium.com/@jasonteunissen/how-do-i-start-styling-in-mendix-gulp-sass-6b37ddaf8de6

If you are more interested in efficient UX design, checkout:
https://blog.prototypr.io/common-ux-mistakes-made-by-business-developers-e837d0b31379

cheers