Ryota-Blog

My Next.js personal blog (Cloudflare Workers / OpenNext) had a mobile LCP as bad as 17.4 seconds. The culprit wasn't images — it was render-blocking CSS and every article's body leaking into the client bundle. A record of hunting each cause down with real traces and getting production LCP to 3.7–4.3s. A Core Web Vitals improvement story.

A record of migrating my Next.js + Cloudflare Workers blog from microCMS to in-repo MDX with Velite. I moved 60 articles with zero conversion loss while keeping every URL intact — and fixed 7 bugs in the old implementation along the way!

Our top 10 best buys of the first half of 2026. After getting married, we furnished a new home from scratch — furniture, appliances, storage. From the 1,880-yen storage wagon that took third place to a 4K TV we got in the 80,000s, each pick comes with its price and a straight answer on who it suits and who should skip it.

A pass report for the JSTQB Foundation Level (CTFL) after 1.5 months of studying. Covers the textbook and free app I used, my generative-AI study method — building a question-authoring engine with Claude Code and drilling 535 questions — and how to check your pass/fail result online.