Today, I visibly notice on first page load and general subsequent page loads that its quite slow. One feature that has improved in Umbraco 15 is tge pagr load perfomance with HybridCache. I read from the snippet from a blog in Umbraco is that is a highly optimised way of caching:-
Umbraco 15 introduces a new cache implementation, built for performance. Designed with a lazy-loaded strategy and solid support for distributed environments. Reduced memory usage, shorter startup times, and support for seamless load balancing across multiple servers. Perfect for content-heavy and high-traffic websites, the new Microsoft HybridCache ensures faster content delivery and a smoother user experience.
Here is a Youtube video two months back in its usage of optimised caching of HybridCache.
HybridCaching