UX Movement on Twitter: "🌟 Users get impatient when actions take longer than 2 seconds… If your button action takes more than 2 seconds to occur, use a Progress Button to show
Submit button loading animation by Victor Wang | Modal window, Web design inspiration portfolio, Success message
Loader / spinner animation | Figma Community
When You Need to Show a Button's Loading State
Loading Button designs, themes, templates and downloadable graphic elements on Dribbble
Button Loading Animation in Bootstrap 4 — CodeHim
How to Create a Button With Loading Spinner in HTML CSS & JavaScript | Loading Button on JavaScript - YouTube
When You Need to Show a Button's Loading State
Create Loading Buttons in iOS using Swift | by Michael T. Ho | The Startup | Medium
iOS button morph to loading - User Experience Stack Exchange