LiteSpeed Cache is a powerful layer. It is not the entire WordPress performance chain.
LiteSpeed Cache can make WordPress delivery dramatically cheaper when a request fits the cached path. That is real value. But the broader performance question starts earlier than cache delivery: how much WordPress work had to happen before a response could be cached, bypassed, regenerated, varied, or optimized?
The cache hit is not the full model
A clean page-cache hit can avoid much of the normal WordPress bootstrap. But real sites are not made only of perfect cache hits. They contain misses, purges, logged-in states, dynamic pages, parameter variants, background endpoints, cart and checkout flows, and requests where the full plugin stack is still awakened.
That is where a performance answer limited to caching becomes incomplete. It explains cheaper delivery, but not the minimum necessary execution scope for each request.
The missing question comes before optimization
Most LiteSpeed-oriented advice focuses on configuration, cache rules, CSS and JavaScript handling, image optimization, object cache, TTFB, and Core Web Vitals. These are useful topics. They belong to the optimization layer.
Rush - Powered by LiteCache adds the earlier layer: do not execute what the current request does not need. It does not replace LiteSpeed Cache. It completes the causal chain before cache and page optimization begin.