Update.

msvc-reduce-qt-binary-file-size.md

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+## msvc reduce qt binary file size
+
+**IMPORTANT NOTE**: file size ≈ performance, so reduce file size ≈ reduce performance, so it's not recommended to reduce Qt binary file size.
+
+- Optimize for size instead of speed
+   ```bat
+   call configure.bat -optimize-size
+   ```
+
+- Enable link time code generation
+   ```bat
+   call configure.bat -ltcg
+   ```
+
+- Disable RTTI
+   ```bat
+   call configure.bat -no-rtti
+   ```
+
+- Use shared MSVCRT library
+
+- Disable C/C++ exception
+
+- Use [UPX](https://github.com/upx/upx/releases) to compress binary files
+   ```bat
+   upx --best "*.dll"
+   ```
+   or
+   ```bat
+   upx --ultra-brute "*.dll"
+   ```