Tinyworldmap is a lightweight world map designed for offline-first and low-bandwidth web apps, perfect for outdated phones with no lag. The complete version is only 300 kB gzipped and displays the 10,000 most populous cities from OpenStreetMap. It can be used as a base map or offline fallback, offering customizable options for different features. Additional versions without borders or cities are available for smaller file sizes and more precise data. For customized maps or help with offline functionality, contact tinyworldmap. Remember to attribute OpenStreetMap and tinyworldmap for data usage. Check out Hitchmap for an example of a production application using tinyworldmap as a fallback map.
https://github.com/tinyworldmap/tiny-world-map