Project: mobx
Task (challenging): 1) Add a button with the text '🔀' in Header to append 100,000 blogs to BlogList at one time. Each blog should have a title formatted in regex 'RandomBlog-[\\d]{12}', digits in title is random. 
2) Ensure the page will not be stuck when 100000 blogs are appended. 
Constraint: DO NOT USE any third-party packages, ONLY React/MobX APIs can be used to optimize performance.