by Automattic 4.7 (607 reviews)

Jetpack Boost - Website Speed, Performance and Critical CSS

Name: Jetpack Boost - Website Speed, Performance and Critical CSS
Rating: 4.7 (607 reviews)
Author: Automattic

Speed up your WordPress site with one-click optimizations like Page Cache, Critical CSS, and Image CDN to improve Core Web Vitals.

Jetpack Boost ranks #245 among WordPress.org plugins with 200,000+ active installations, is #24 of 1,518 in the Performance category, a 4.7/5 rating from 607 reviews, and was last updated Aug 17, 2026. Data from WordPress.org, refreshed twice daily — see methodology.

Tested up to WP 7 (Current: 7.1)

v4.7.0 Current Version v4.7.0

Updated 4 weeks ago Last Update on 17 Aug, 2026

Refreshed 7 hours ago Last Refreshed on

#24 of 1,518 in Performance Top 1% by installs Downloads -22.5% this week Actively maintained

View on WordPress.org

Rank

#245

— No change

Active Installs

200K+

-21.4%

KW Avg Position

0.8 better

Downloads

12.6M

+1,774 today

Support Resolved

100%

— No change

Rating

94%

Review 4.7 out of 5

4.7 (607 reviews)

Next Milestone 300K

Total Progress 50.6%

200K+ 300K+

Ranks to Climb

Growth Needed

8,000,000

Active Installs

Pro

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Need 49,368 more installs to reach 300K+

Rank Changes

Current #245

Change

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Active Installs Growth

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Active Installs 0,000,000+

Growth +0.0%

Peak 0,000,000

Downloads Growth

Downloads

Growth

Peak

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Reviews & Ratings

4.7

607 reviews

Overall 94%

533 (88%)

20 (3%)

11 (2%)

8 (1%)

35 (6%)

Support Threads Overview

Resolved

Unresolved

Total Threads

Resolved

Unresolved

100%

Resolution Rate

Security History

Source: WPVulnerability

2 known vulnerabilities on record · 1 in the last 24 months · checked 1 week ago

Oct 17, 2024

Jetpack Boost – Website Speed, Performance and Critical CSS [jetpack-boost] < 3.4.8

CVE-2024-10076 · Fixed in v3.4.8
Jul 8, 2024

Jetpack Boost – Website Speed, Performance and Critical CSS [jetpack-boost] < 3.4.7

CVE-2024-6584 · Fixed in v3.4.7

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Plugin Details

Version: 4.7.0
Last Updated: Aug 17, 2026
Requires WP: 6.9+
Tested Up To: 7
PHP Version: 7.2 or higher
Author: Automattic

Support & Rating

Rating: ★ ★ ★ ★ ★ 4.7
Reviews: 607
Support Threads: 2
Resolved: 100%

Keywords

Critical CSS cache performance speed web vitals

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TL;DR

AI summary of the plugin's readme

This plugin is for WordPress site owners who want to improve their site's speed and Core Web Vitals scores without technical expertise. It solves slow page loading, poor visual stability, and delayed interactivity by offering one-click performance optimizations like caching, critical CSS, and image delivery.

Page Cache for static files
Critical CSS generation
Automated critical CSS regeneration
Defer Non-Essential JavaScript
Image Guide for optimization
Image CDN delivery
Concatenate and Minify CSS/JS
Dedicated email support access

Frequently Asked Questions

Common questions about Jetpack Boost - Website Speed, Performance and Critical CSS

Jetpack Boost makes small changes to the way that data is sent from your WordPress site to your users’ browser, to enable the browser to display your site faster. Jetpack Boost includes a growing number of separate features which can be turned on individually to improve your site’s performance. These include: Optimize CSS Loading: This feature determines the most important CSS that your site needs to display your site’s initial content as quickly as possible, and embeds it directly into your site header. Page Cache: This feature stores your website's pages as static HTML files, bypassing the need for dynamic generation. This means visitors receive pages faster, reducing wait times and improving overall site performance. Defer Non-Essential JavaScript: This feature forces all of the JavaScript which is not deemed essential to displaying your site to load after your site’s main content has been loaded. Image CDN: This feature automatically resizes images to a more appropriate size for your visitors' screens, converts them to modern image formats, and serves them from Jetpack's worldwide network of servers. Concatenate JS: This feature reduces the size of your JavaScript resources, and automatically combines them into fewer files, allowing your site to load faster with fewer requests. Concatenate CSS: As with concatenating JavaScript, this feature shrinks your CSS files and allows them to load with fewer requests.

Website Performance is complicated and can be affected by a number of factors. As a result, it is difficult to accurately predict how much impact it will have on each site. Generally, the lower your speed score is to begin with, the more Jetpack Boost may impact your performance. We have seen user reports of up to 25 Speed Score points improvement simply by installing and using Jetpack Boost.

We recommend that you install Jetpack Boost, and try it for yourself. It includes a tool for measuring your Speed Score, to check what impact it has on your site.

Jetpack Boost automatically defers non-essential CSS if its “Optimize CSS Loading” feature is enabled. The “Optimize CSS Loading” feature identifies the most important CSS rules your site needs to display your pages as quickly as possible (commonly called “Critical CSS”), and defers all other CSS rules from loading until your main content has loaded.

Web Vitals are the measurements that Google uses to better understand the user experience on a website. By improving Web Vitals scores you're also improving the user experience on your site. You can read more about Web Vitals on web.dev

Each Core Web Vital relates to an aspect of how quickly your site can load and appear on new visitors’ screens. Jetpack Boost makes small changes to the way that data is sent from your WordPress site to your users’ browsers, to enable your content to load faster. As a result, it can improve your Core Web Vitals scores. For example, our “Optimize CSS Loading” feature ensures the most important CSS rules are sent to users’ browsers as early as possible, improving both First Contentful Paint (FCP) and Cumulative Layout Shift (CLS) scores.

Jetpack Boost is a part of the Jetpack brand, but it doesn’t require Jetpack plugin to run. This is a separate plugin from Jetpack and it will always remain that way.

This plugin includes a range of performance improvements, which can help almost any WordPress site perform better.

Jetpack Boost includes a tool for measuring your site’s Speed Score - we encourage users to try it out and see what impact it can have for them.

Every site is different and so performance benefits for each module may vary from site to site. That's why we recommend that you measure the performance improvements on your site by enabling the performance modules one by one. There are many tools out there that you can use for free to measure performance improvements: WebPageTest.org web.dev/measure PageSpeed Insights GTMetrix Google PageSpeed measurements are built-in the Jetpack Boost dashboard.