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Improving mobile performance on Helix Ultimate, typically involves several strategies. Here are some tips that may help you increase your PageSpeed score:
Optimize Images: Ensure all images are compressed and sized appropriately for mobile devices. Use formats like WebP for better performance.
Minify CSS and JavaScript: Reduce the size of your CSS and JavaScript files by minifying them and removing any unnecessary code.
Use Caching: Implement browser caching and consider using a caching plugin to help load your pages faster.
Reduce Number of HTTP Requests: Combine CSS and JavaScript files where possible to lower the number of requests made by the browser.
Implement Lazy Loading: Use lazy loading for images and videos so that they only load when they're visible in the viewport.
Choose a Fast Hosting Provider: Ensure your hosting provider offers good performance, especially for mobile users.
Limit Third-Party Scripts: Review and limit the use of third-party scripts, as these can slow down your site.
Use a Content Delivery Network (CDN): A CDN can accelerate the delivery of your content by serving it from locations closer to your users.
For more information you can also follow this documentation below:
https://www.joomshaper.com/blog/how-to-speed-up-joomla-site
-Regards.