#Japan #Tokyo #E-Commerce #Site Speed #Gaprise

Overview of December 2025 E-Commerce Website Speed Rankings

Gaprise, a company supporting digital business through global SaaS solutions, has published its rankings of e-commerce site speeds for December 2025. This article will delve into the details of the research, the findings, and the implications for online businesses in Japan.

Research Methodology

• - Timeframe of Study: Data collected as of December 2025.
• - Conducting Agency: The study was conducted by Gaprise.
• - Target Sites: Analyzed were the top 300 companies in the 83rd e-commerce sales ranking published by the Online Shopping Newspaper, focusing on those with monthly traffic exceeding 100,000 visitors.
• - Method of Data Collection: The analysis utilized Google’s Chrome User Experience Report dataset, specifically examining the Largest Contentful Paint (LCP) on mobile devices over a 4G connection. LCP measures the time it takes for the largest visible content to load on a webpage, indicating the speed at which users can access main content.

Understanding LCP

LCP, which stands for Largest Contentful Paint, is one of the Core Web Vitals defined by Google. It measures the loading time of the most significant visual content of a webpage, usually an image or the main text. A lower LCP score indicates that crucial content is displayed more quickly, thereby improving user experience. According to Google, a good user experience is defined as having an LCP under 2.5 seconds, whereas anything over 4 seconds results in a poor user experience. Renault's case study noted that improvements can lead to an LCP under 1 second, significantly enhancing site performance.

Ranking Results – Top 10 Sites

Achievements of the Top 10

A notable observation from the latest research is that all top 10 sites achieved an LCP score of 1.2 seconds or less. Particularly impressive were sites like Murauchi.com, AmiAmi Online Shop, LifeNet Super, and Chacott, each managing to break through the 1.0-second barrier, demonstrating optimal load speed.

General Situation

Among the 269 websites evaluated, around 75.1% (202 sites) met the threshold of 2.5 seconds for LCP. This reveals that a significant majority of e-commerce platforms are acknowledging the importance of load speed and actively working on improvements.

Murauchi.com – A Standout Case

One of the most remarkable transformations was seen with Murauchi.com. Initially ranked 17th with an LCP of 1.178 seconds in February, it improved to 0.979 seconds by April. By June, it ascended to the top spot, maintaining a lead thereafter. Their December score hit an astonishing 0.696 seconds. This rapid advancement exemplifies how strategic enhancements can yield significant results in a short timeframe, reinforcing their position as the annual champion.

Core Web Vitals New Metric: INP Excellence

As 2025 wraps up, the top 5 in the new Input Responsiveness (INP) metric features well-established sites like Tamago Base and Elecom, which consistently maintained high rankings throughout the year. Notably, these companies also recorded impressive LCP scores, combining responsiveness with load speed to provide a seamless shopping experience.

The INP metric evaluates the responsiveness of a webpage to user interactions, offering a comprehensive view of site performance when analyzed alongside LCP. Companies should focus on both INP and LCP when strategizing for performance improvements. Successful enhancements typically stem from optimizing JavaScript execution, improving event handler efficiency, and boosting rendering performance.

In summary, the importance of continuous improvements and adopting new technologies is underscored by findings related to both LCP and INP.

Conclusion

For more detailed data about the remaining 269 sites and improvement cases, visit our media outlet, MarTechLab.

Our Expertise at Gaprise

Gaprise provides various website speed improvement services. With Japan's enterprise IT expenditures projected to grow significantly, we aim to empower businesses by identifying and implementing innovative technologies worldwide. We pride ourselves on our unique market position and our ability to offer diverse solutions tailored to client needs. As we move forward, we continue to enhance our services, including Speed Improvement Tools set to launch in February 2024. Through advanced technologies and consulting, we support clients’ business growth by optimizing their online user experience.

Company Overview:
Name: Gaprise Inc.
Founded: January 27, 2005
CEO: Ryoji Kai
Capital: 20 million yen
Location: 11F KANDA SQUARE, 2-2-1 Kanda Nishikicho, Chiyoda-ku, Tokyo
Website: Gaprise

All mentioned company names and product/service names are trademarks or registered trademarks of their respective companies.