diff --git a/README.md b/README.md
index 9f84891..57ad5f4 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,6 @@
 # features
 
 ## Performance and SEO
-- [ ] Optimized for performance: 99/100 on mobile and 100/100 on desktop in Google PageSpeed Insights
 - [ ] Optimized SEO performance with a correct SEO SCHEMA based on JSON-LD
 
 ## Appearance and Layout
@@ -14,10 +13,5 @@
 ## Extended Features
 - [ ] Search support
 - [ ] Twemoji supported
-- [ ] Automatically highlighting code
-- [x] Copy code to clipboard with one click
-- [ ] Mathematical formula supported by KaTeX
-- [ ] Diagrams shortcode supported by mermaid
-- [ ] Interactive data visualization shortcode supported by ECharts
 - [ ] Dynamic scroll supported by native CSS
 - [ ] Cookie consent banner supported by cookieconsent