diff --git a/README.md b/README.md
index e8e8aa4d..560520a2 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Rust编程指南
 
-- 官方书名： Rust编程指南(The Way To Rust)
-- 官方网址： https://wayto.rs
+- 官方书名： Rust编程指南(Rust Course)
+- 官方网址： https://course.rs
 - 修订时间： **尚未发行**
 - Rust版本：Rust edition 2021
 - QQ交流群： 1009730433
diff --git a/book.toml b/book.toml
index df045b2b..1ce02801 100644
--- a/book.toml
+++ b/book.toml
@@ -1,13 +1,13 @@
 [book]
 authors = ["sunface"]
 language = "zh-CN"
-title = "Rust编程指南(The Way To Rust)"
+title = "Rust编程指南(Rust Course)"
 
 [output.html]
 additional-css = ["assets/ferris.css", "assets/theme/2018-edition.css"]
 additional-js = ["assets/ferris.js"]
 git-repository-url = "https://github.com/rustcollege"
-edit-url-template = "https://github.com/rustcollege/the-way-to-rust/edit/main/{path}"
+edit-url-template = "https://github.com/rustcollege/rust-course/edit/main/{path}"
 
 [output.html.fold]
 enable = true
diff --git a/release b/release
index ff028677..557826ee 100755
--- a/release
+++ b/release
@@ -13,7 +13,7 @@ git config user.email "cto@188.com"
 git add .
 git commit -m 'release book'
 git branch -M gh-pages
-git remote add origin https://github.com/rustcollege/the-way-to-rust
+git remote add origin https://github.com/rustcollege/rust-course
 
 ## push to github pages
 git push -u -f origin gh-pages
\ No newline at end of file
diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index 9aa09c0b..feef69a1 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -62,7 +62,8 @@
     - [条件编译、条件依赖](cargo/feature.md)
     - [配置参数(todo)](cargo/manifest.md)
     - [自定义构建脚本](cargo/build-js.md)
-
+    - [Cargo profile](cargo/profile.md)
+    
 - [测试](test/intro.md)
     - [单元测试](test/unit.md)
     - [集成测试](test/intergration.md)
diff --git a/src/about-book.md b/src/about-book.md
index 39fb0a61..bfdcefb3 100644
--- a/src/about-book.md
+++ b/src/about-book.md
@@ -4,8 +4,8 @@
 
 ## 关于本书
 
-- 官方书名： Rust编程指南(The Way To Rust)
-- 官方网址： https://wayto.rs
+- 官方书名： Rust编程指南(Rust Course)
+- 官方网址： https://course.rs
 - 修订时间： 尚未发行
 - Rust版本：Rust edition 2021
 - QQ交流群： 1009730433
diff --git a/src/cargo/profile.md b/src/cargo/profile.md
new file mode 100644
index 00000000..7f6d100d
--- /dev/null
+++ b/src/cargo/profile.md
@@ -0,0 +1,4 @@
+# Cargo profile
+
+
+## custom profiles (rust 1.57.0)
diff --git a/writing-material/posts/performance.md b/writing-material/posts/performance.md
index 58a5c79a..d1286bb6 100644
--- a/writing-material/posts/performance.md
+++ b/writing-material/posts/performance.md
@@ -4,4 +4,15 @@
 
 
 ## crates
-1. [高性能Mutex库](https://github.com/Amanieu/parking_lot)
\ No newline at end of file
+1. [高性能Mutex库](https://github.com/Amanieu/parking_lot)
+
+## 不要通过环境变量来控制在不同环境下的tracing行为
+
+这种控制消耗很大，随着rust 1.57.0版本发布，可以使用自定义cargo profile的方式来实现
+
+cargo profile可以做：
+Enable costlier tracing/logging/debug on staging builds, or force LTO only for production builds.
+
+
+为何不要用环境变量来控制tracing库的行为:
+If your app is in any way performance sensitive you are carrying a significant cost for that.
\ No newline at end of file
diff --git a/writing-material/posts/rust-analyser.md b/writing-material/posts/rust-analyser.md
new file mode 100644
index 00000000..d3d65d42
--- /dev/null
+++ b/writing-material/posts/rust-analyser.md
@@ -0,0 +1,3 @@
+## 可以为rust-analyzer指定一个check文件夹，避免构建的cache被lock住
+
+You can already setup rust-analyzer to use different folder. I set `Check On Save` to `check` and in `Check On Save: Extra Args` to `--target-dir target/rust-analyzer-target`.
\ No newline at end of file