E-commerce Site Sluggish Due to Increased Products and Navigation Design Improves Display Speed by Up to 4x with Repro Booster, Contributing to Sales Growth

Repro Inc. (hereinafter 'the Company'), which supports the maximization of Web and app revenue through the provision of marketing solutions, announces that its website display speed improvement tool 'Repro Booster' has been introduced to the e-commerce site 'ENDLESS MODE' operated by Endless Inc. Endless Inc. had introduced 'EBISUMART' as its e-commerce foundation and was aiming to further improve the customer experience (UX) while accelerating business growth through brand integration. The introduction of Repro Booster contributed to a significant improvement in display speed and an increase in sales. Along with this, an interview article detailing the background, decision-making process, and specific results of this initiative was published today.

In recent years, with the expansion of the e-commerce market, performance issues have increasingly surfaced due to the expansion of site functions and the increase in the number of products. Improving display speed has become an important theme directly linked to sales.

Endless Inc. operates the accessory parts specialty store 'PARTS CLUB' and the accessory brand 'LUNA EARTH', promoting an e-commerce business across multiple brands.

The company integrated its previously scattered brand e-commerce sites and built the shopping mall-type e-commerce site 'ENDLESS MODE' by introducing the cloud-based e-commerce platform 'EBISUMART'. It has grown to a scale visited by over 1 million people monthly.

On the other hand, due to a complex category structure of about 50,000 items and content accumulated over many years, the data volume increased, taking 7 to 8 seconds to display a page, creating an issue that affected the user experience.

Under these circumstances, 'Repro Booster' was adopted because it was highly evaluated for its ease of implementation (requiring only tag installation), immediate effectiveness expected in a short period, and quick improvement speed. Its high compatibility with 'EBISUMART' was also a decisive factor.

Implementation Results

The following results were obtained by introducing 'Repro Booster'.

Significant Improvement in Display Speed FCP: 75.7% improvement LCP: 76.4% improvement

Customer Experience and Business Results Resolution of complaints from customers and internally regarding display delays Reduction in bounce rate Increase in page navigation Improvement in the number of items purchased and average customer spend

Especially as purchasing behavior predicated on comparison and consideration becomes generalized, site display speed has become an element that greatly affects not only customer experience but also purchasing decision-making.

*Filmed at 16Mbps throttling using Google Chrome's emulation function

Speed Metrics Repro Booster Not Applied | Repro Booster Applied | Speed Equivalent | Improvement Rate FCP | 2.028 seconds | 0.492 seconds | Approx. 4.1x faster | 75.7% LCP | 2.336 seconds | 0.552 seconds | Approx. 4.2x faster | 76.4%

KPI Metrics Repro Booster Not Applied | Repro Booster Applied | Improvement Rate Session CVR | 1.13% | 1.32% | 16.8% PV | 6.62 | 7.13 | 7.7%

*Results of an A/B test on whether Repro Booster was applied to mobile users from October 1, 2025, to January 15, 2026. The comparison targets the median of FCP and LCP, CVR in the first session, and average PV per session.

Evaluation from the Adopting Company

Regarding the introduction of Repro Booster and its results, we received the following comment from Mr. Yuichi Koike, Manager of the Digital Commerce Team, Sales Group, Endless Inc.

-- Comment from Mr. Yuichi Koike -- If we had entered the promotional event with the site display still slow, I don't think we would have achieved this level of sales. The improvement in display speed has positively...