The most direct answer to INP available, at $29.95 a year for one site, $59.95 for three, and $124.95 for unlimited sites, with 15% off on renewal. Its script manager lets you disable individual plugin scripts on a per-page basis.

That is the correct intervention, because the fastest script is the one that never loads. A typical WordPress site loads its contact form library on every post, its slider library on every page, and its social sharing code on pages with no sharing buttons. Turning those off where they are not needed removes main thread work outright rather than rescheduling it. It also handles script delay and deferral for the ones you keep. At $124.95 for unlimited sites this is the cheapest INP intervention an agency can make across a portfolio, and it sits alongside your caching plugin rather than replacing it.

• Price: $29.95/yr for 1 site; $124.95 for unlimited
• Method: Per-page script disabling, plus delay and defer
• Best for: Almost every site with an INP problem
• Watch out for: Disabling the wrong script breaks a feature

Built around what users experience rather than what a lab test rewards, which in 2026 means built around INP. Starter is $59 a year for one site, Pro $109 for three, Business $229 for 25 and Unlimited $279, with a 14-day trial giving full access before any charge.

Its script handling is more aggressive than its competitors’, delaying JavaScript until user interaction and loading it in an order chosen for responsiveness rather than for lab metrics. That produces better real-world interaction numbers and a higher chance of breaking something, which is precisely why the trial matters. The $279 unlimited tier is the best price in this comparison for anyone with more than a handful of sites. Use the trial on a site with a real INP problem and measure the field data afterwards rather than the score.

• Price: $59/yr for 1 site; $279 for unlimited
• Method: Aggressive JavaScript delay and load ordering
• Best for: Agencies, and sites where INP is the failing metric
• Watch out for: Aggressive by design; trial before deploying

$59 a year for one site, $119 for three, $299 for fifty, and relevant here for its delay JavaScript execution feature, which holds selected scripts until the visitor interacts with the page.

Delaying a chat widget, an analytics tag or an advertising script until first interaction removes it from the initial main thread contention entirely, which improves both LCP and the early interactions INP measures. The distinction from Perfmatters is worth understanding: WP Rocket defers work, Perfmatters removes it. Deferring is safer and helps less; removing is more effective and requires you to know which scripts each page needs. Many sites end up running both, which is a coherent arrangement since one is a caching plugin and the other is not.

• Price: $59/yr for 1 site, $119 for 3, $299 for 50
• Method: Delay JavaScript until interaction; safe defaults
• Best for: Sites wanting improvement without configuration risk
• Watch out for: Deferring helps less than removing

A free plugin doing the same fundamental job as Perfmatters: unloading CSS and JavaScript on pages that do not need them, with a paid tier adding refinements.

For anyone unwilling to spend money before proving the approach works, this is the way to test the hypothesis. Install it, look at what is loading on a typical post, and unload the obvious offenders, the contact form library on an article, the ecommerce scripts on a blog page. If your INP improves, you have confirmed that script removal is your fix and can decide whether the paid alternatives are worth their price. It demands more attention than Perfmatters and gives you the same lever, and the risk is identical: unload something a page quietly depends on and a feature stops working somewhere you did not check.

• Price: Free, with a paid tier
• Method: Unloading CSS and JavaScript per page
• Best for: Proving script removal fixes your INP before paying
• Watch out for: Test every template after unloading anything

A hosted service handling optimisation on its own infrastructure, with delayed scripts arriving at the Plus tier, $22 a month or $18 billed annually for 40,000 pageviews on one site. The free plan covers 1,000 pageviews a month, Starter is $8 a month for 8,000, and Pro is $99.99 a month for 540,000 across three sites.

Two things to weigh. The script delay feature relevant to INP is not in the cheapest paid tier, so a Starter subscription does not buy you the thing this article is about. And the pageview meter escalates quickly: a site doing 100,000 monthly pageviews sits between tiers where a $59 annual plugin licence would cost less than a single month. Where it earns its price is a small site whose owner wants scores handled entirely, without configuring anything, and is comfortable routing traffic through a third party.

• Price: Free for 1,000 views; $8, $22 or $99.99 a month
• Method: Hosted optimisation; delayed scripts from Plus
• Best for: Small sites wanting it handled entirely
• Watch out for: Script delay needs the $22 tier, not the $8 one

Free, permanent, and the fix nobody sells you. Once you have identified which script is blocking the main thread, the question worth asking is whether you need it at all rather than how to defer it.

The usual candidates are worth naming. A live chat widget that produces two enquiries a month while taxing every visitor’s interaction. A heat mapping tool installed for a redesign that finished eighteen months ago. Three analytics products where one would do. A page builder loading its full runtime on pages built with blocks. Each of those is a decision somebody made once and nobody has revisited, and removing one is worth more than any optimisation applied to keeping it. Self-hosting fonts belongs on the same list: it removes a third-party request, resolves a privacy problem, and costs nothing.

• Price: Free
• Method: Deleting work rather than scheduling it
• Best for: Every site, after identifying the culprit
• Watch out for: Get agreement before removing marketing tooling