Yahoo! Japan’s Core Web Vitals Project

This may surprise you but Google is Yahoo! Japan’s one of the top traffic generators. For the last 2 years, Yahoo! Japan has been working to improve their websites’ Core Web Vitals scores just like the rest of us.

Recently, they shared the latest performance improvements and the results on their technology blog. Here’s the summary of that article.

4 Main Points of Improvement

  1. Visualize the impact of Core Web Vitals improvements
  2. Documentation and knowledge-share with vertical departments
  3. Improvement requests to other service groups
  4. Improvement requests to a shared platform with other service groups

In order to visualize the impact, and share the data with everyone involved, they created reports using both field data and lab data. They also pulled the CWV-related information from the Lighthouse tool into the reports.
The reports are created for each of their services, pulling data from multiple pages.

Yahoo! Japan offers a variety of services, and each service group has its own team responsible for the site. While each group functions by itself on daily basis, a critical project such as CWV requires everyone to be on the same page. To help educate everyone, they created a knowledge base about Core Web Vitals with some great examples.

As many companies experience, it takes a while to get things done when it comes to website changes, and it’s even longer for a big corporation like Yahoo! Japan. To ensure that the project progresses, they created an action item tracking sheet shared with all concerned groups.

On the tracking sheet, they provide “issues”, “recommended changes”, “the reason why it’s an issue in relation to LCP/CLS/FID metric”, and “priorities”. There’s also a column for the group to enter the progress status.

Most importantly, they track the performance of each content/service group showing the impact of the issues improved or solved. It’s great that they can all see how other groups are doing.

You can see some of their report examples on their article page: