Web Development

Here are some steps you can follow to increase your page loading speed on mobile:-
1. First of all measure your server speed time.
2. Minimize the JS and CSS files.
3. Use CSS3 instead of images.
4. Instead of JPEGs use SVGs.

I would suggest you use wp rocket. It is a paid plugin. If you want some alternatives:
1. Use a minimal theme with fewer animations.
2. Theme should be mobile compatible
3. Use hummingbird, autoptimize, fast velocity minify and tiny png(for image compressing).
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If you want to improve your mobile loading speed, I would suggest looking into the following:

1. Run your site through a speed testing tool like GTmetrix, Pingdom, or Google PageSpeed Insights. Follow the advice you get from there. In particular:
2. Check if your host answers quickly, if not, change hosts or ask how they can increase your loading speed. On shared hosts, sometimes they can move you to a less busy server.
3. Make sure you are using the latest version of your server technology. Especially PHP has seen some big speed improvements with updates, so be sure you are at least on version 7.0
4. Enable compression to shrink the size of the files users need to download
5. Decrease the number of HTTP requests to a minimum. The speed testing tools mentioned above will help you pinpoint bottlenecks. In particular, you might:
- Lower the number of posts shown on a page
- Only show post excerpts, no full posts on your archive pages
- Split longer posts into pages
- Reduce the number of images and other elements on your page
- Enable lazy loading to delay loading images until they are actually visible on the page
- Reduce external resources such as fonts if they aren’t necessary
6. Optimize your images so that they are only as large in size as they need to be
7. Enable page caching
8. Consider using a Content Delivery Network (CDN)
9. Minify your files. Again, to make them load faster.
10. Use HTTPS

Hope this helps. Let me know if you have any questions.