Tania Rascia describes her journey of migrating her blog from WordPress to Gatsby, highlighting the increased site speed and performance improvements achieved through this transition. Initially, her WordPress site was optimized, but still cumbersome and limited in speed, prompting her to explore static site generators. She chose Gatsby due to its ability to leverage modern web technologies like code splitting, pre-loading, and image optimization. The migration process, which she anticipated would be arduous, took 10 days and involved converting WordPress content to Markdown, adapting styles using Sass, and employing tools like ExitWP and Netlify for deployment. With Gatsby's Node.js and React foundation, Rascia could create a single-page application with seamless navigation, improved image handling, and efficient resource pre-fetching. She emphasizes that while setting up a Gatsby site requires knowledge of various technologies, the result is a faster, more maintainable, and version-controlled website.