WP Rocket, Imagify and similar tools can be useful. They are not a substitute for understanding why a specific website feels slow or what can safely be changed.
Performance depends on the whole customer journey: hosting, theme and page builder choices, image handling, scripts, third-party widgets, cache behaviour, mobile connections and the booking, form or ecommerce tools a business depends on. A plugin may improve one part of that picture while creating an issue elsewhere if it is applied without care.
The real business question is not whether a test score can be made greener. It is whether the site loads and responds well for real customers without breaking the things that make money. A rental calendar, property search, payment process or consent banner needs testing after performance work just as much as a home-page image.
This is why performance work belongs inside safe website management. Establish a sensible baseline, identify the biggest avoidable friction, make a controlled change and check the journeys that matter. The outcome might involve image optimisation, caching, cleaner page assets or a deeper recommendation — but the business should not have to gamble on a setting it does not understand.
Speed is a customer-experience issue, not a plugin-shopping exercise. Done well, it supports visibility, confidence and conversion while protecting the systems already in place.