KUSANAGI loads WordPress even faster – “Theme Accelerator” resolves bottlenecks and loads 50% faster

TOKYO – July 27, 2023– Prime Strategy Co., Ltd. (hereinafter, “Prime Strategy”) announced that it has started offering a “Theme Accelerator” that loads faster of WordPress on the ultra-fast CMS execution environment “KUSANAGI”.

Users can speed up the display of their WordPress site without having to customize the theme or install plug-ins.

Why develop “Theme Accelerator”?

WordPress, which is used by 43.1% of websites*, continues to be developed for a better user experience as a tool for information dissemination.

*, 27 July 2023 Usage statistics of content management systems 

In WordPress 5.0, the block editor (Gutenberg) became the standard editor. Users can now produce articles in an intuitive way.

And recently, the ability to assemble parts such as headers, footers, and sidebars, which have been managed by templates, using blocks from the administration screen has been added.

This feature is called Full Site Editing. In application development, low-code and no-code methods that require as little code as possible are gaining attention, and the change in the way WordPress sites are created is also in line with this trend.

However, along with these enhanced features, WordPress tends to display slower. WordPress 5.8 vs. 6.1 showed up to 69% speed reduction. (According to our research)

WordPress is also taking steps to improve speed. However, we thought it would be preferable to support an environment where non-engineering users can speed up their sites as easily as possible when they create them using new methods. Therefore, we decided to develop an acceleration function for the theme.

Acceleration by “Theme Accelerator”

The Theme Accelerator determines which themes are conventional themes and which themes support full site editing, and accelerates each of them. It is particularly effective for sites with large amounts of data, complex customization of headers and footers using blocks, and sites that cannot use page caching.

The following data compares the speed of a theme that supports Full Site Editing and a traditional theme with the “Theme Accelerator” disabled and enabled.We used data from our corporate website to measure case study list pages and single page

Full Site Editing Theme
List Page
Full Site Editing Theme
Single Page

Traditional theme
List Page
Traditional theme
Single Page
“Theme Accelerator” Enabled10.9% Faster9.7% Faster 53.0% Faster 24.9% Faster

*Measured median access time with 4 threads and 1000 loop requests
*Traditional theme is GeneratePress, full site editable theme is X-T9

The percentage of speedup will vary greatly depending on the theme, plug-ins, amount of content, etc., but you can expect a 10% improvement in display speed for a theme that supports full site editing, and 25% to 50% for a traditional theme.

How to Use

Select “Other” in the “KUSANAGI plugin settings” in the administration screen, and activate it by checking the “Theme Accelerator” checkbox.

Theme Accelerator

You can delete the cache with the “clear cache” button on the admin bar at the top of the admin page.


The full site editing functionality is in the development stage. We will keep an eye on future updates and continue our research and development to provide a fast website operation environment to as many people as possible, while growing KUSANAGI into a more unique product that meets market needs.

Related Technical Information

If you are interested in learning more about the Theme Accelerator, please see the column below.(Japanese only)

The Ultra-fast CMS platform “KUSANAGI”

KUSANAGI is a fast and secure virtual machine image developed and provided by Prime Strategy. KUSANAGI is available in 209 regions in 34 countries, on 31 major domestic and international platforms (as of May 2023), with a cumulative total of over 70,000 units in operation (as of February 2023).

KUSANAGI 9 can handle more than 25,000 concurrent requests per second (HTTP) in a typical cloud environment (*1) when using page caching, and more than 210 concurrent requests per second (both HTTP and HTTPS) when not using page caching. Compared to the standard LAMP environment (*2), the speedup is approximately 2,330 times faster when page cache is used, and approximately 20 times faster when page cache is not used.

Three editions are offered: the “Free Edition” for personal use, the paid “Business Edition” for business use, and the paid top-of-the-line “Premium Edition” for business use, which includes the WEXAL® Page Speed Technology® web acceleration engine.

*1 Microsoft Azure Standard D4as_v4インスタンス (2.35Ghz AMD EPYC 7452 プロセッサ 4 vCPU, 16GiB), Premium SSD LRS, 東日本リージョン, KUSANAGI 9.1.0-1, PHP 7.4.27, Nginx 1.21.4, MariaDB 10.5.13, WordPress 5.8.2 で計測

*2: Microsoft Azure Standard D4as_v4インスタンス (2.35Ghz AMD EPYC 7452 プロセッサ 4 vCPU, 16GiB), Premium SSD LRS, 東日本リージョン, CentOS 7.9.2009, PHP 5.6.40, Apache 2.4.6, MariaDB 5.5.68, WordPress 5.8.2 で計測

About Prime Strategy

Prime Strategy, Co., Ltd. is a software developer providing web acceleration solutions. We have locations in Tokyo and New York.

Company NamePrime Strategy Co., Ltd.
(Tokyo Stock Exchange Standard Market 5250)
Main OfficeOgawa Bldg. 10F, 1-2-2 Uchikanda, Chiyoda-ku, Tokyo Japan 101-0047
Service DetailsKUSANAGI Stack Business
・Management service
・Website acceleration service
・System integration service

KUSANAGI Stack Development and Provision
・Ultra-fast CMS platform “KUSANAGI”
・Web Acceleration Engine ”WEXAL® Page Speed Technology®”
・Strategic AI “ONIMARU® David”

Press Contacts

Prime Strategy Co., Ltd.
Chieko Aihara
Ogawa Bldg. 10F, 1-2-2 Uchikanda, Chiyoda-ku, Tokyo Japan 101-0047
Phone: 81-3-6551-2995 / Fax: 81-3-6551-2941
Mail :

*Company and product titles mentioned in this press release are trademarks or registered trademarks of their respective companies.

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