The use of headings and subheadings in blog posts can improve SEO performance in several ways. Firstly, headings and subheadings help to break up the content into easily scannable sections, making it more readable and user-friendly. This improves the overall user experience, which is a key factor in SEO rankings. Additionally, headings and subheadings provide an opportunity to include relevant keywords, which can help search engines understand the content and rank it for relevant queries. By incorporating keywords into headings and subheadings, you can enhance the overall relevance and visibility of your blog post in search results.