I have been thinking about speculative loading more this year because it sits in an interesting place between performance and prediction.
The basic idea is attractive. If the browser can start loading a page before the visitor fully navigates to it, the next page can feel faster. In WordPress, this has become more visible with recent core work around speculative loading, but the broader idea is not limited to WordPress. It is part of a wider shift towards using the browser to make navigation feel more immediate.
The part I find interesting is not only the speed improvement. It is the assumption behind it. The website is making a small guess about what the visitor might do next. That can be helpful, but it should still be treated as a decision rather than magic.
Perceived Speed Matters
A website does not always need to reduce every possible millisecond to feel better. Sometimes the most noticeable improvement is the way movement between pages feels. If a visitor clicks from a listing page to an article and the article appears almost immediately, the site feels more responsive even if the underlying content has not changed.
That kind of perceived speed matters because visitors experience the website as a sequence of decisions. They scan, click, wait, read, go back and continue. The smoother those steps feel, the less effort the site asks from them.
Speculative loading supports that flow by preparing likely next pages. On a blog, that might mean preloading a link the visitor is hovering over. On a service page, it might mean preparing a contact page once intent becomes clear. Used carefully, it can reduce the pause between decision and result.
Guessing Has A Cost
The caution is that guessing is not free. If the site starts preparing pages the visitor never opens, work has still been done. Bandwidth may have been used, the server may have handled requests and the browser may have spent effort on something unnecessary. On a small site with sensible rules, that may be acceptable. On a heavier site, it needs more thought.
This is why I would not treat speculative loading as a replacement for ordinary performance work. If the pages are too heavy, preloading them only moves the cost earlier. If the site has expensive tracking or slow third-party scripts, the next navigation may still be held back by other parts of the page.
The best use is probably targeted. Let the browser prepare likely navigations without becoming aggressive. Avoid preloading actions that might have side effects. Be careful around logged-in areas, cart behaviour, forms and anything that changes state.
WordPress Makes It More Mainstream
What interests me about WordPress adopting this kind of feature is that it brings modern browser behaviour into ordinary websites. Most site owners will never write speculation rules manually. They will benefit from the platform making careful default decisions, then developers can adjust where a project needs different behaviour.
That is a good direction, but it also means developers need to understand what is happening. When a performance feature is added by default, it becomes part of the site’s behaviour. If something feels strange, or if a host shows unexpected requests, someone needs to know where to look.
I like defaults that help, but I still want enough visibility to decide whether they fit the project. A brochure site, a content-heavy publication and a logged-in customer portal should not all be treated in exactly the same way.
Retrospective Thoughts
Speculative loading is useful because it makes the web feel faster at the point where people notice delay most: after they have chosen to move somewhere. That is valuable. The mistake would be treating it as a shortcut around better pages, cleaner scripts and sensible hosting.
The way I look at it now is simple. Let the browser help when the next step is obvious, but do not make the website waste effort pretending it can predict everything. Performance work still needs judgement. The feature is only useful when the guess is sensible.