diff --git a/toolchain/build.sh b/toolchain/build.sh
index e5a4dee..69ec076 100644
--- a/toolchain/build.sh
+++ b/toolchain/build.sh
@@ -164,6 +164,12 @@ elif [ "$model" = "OpenWrt_X86_64_v24.10" ]; then
     curl -s https://git.kejizero.online/zhao/files/raw/branch/main/toolchain/Configs/immortalwrt_x86_64.config > .config  
 fi
 
+# LTO
+curl -s $mirror/generic/config-lto >> .config
+
+# mold
+echo 'CONFIG_USE_MOLD=y' >> .config
+
 # gcc14 & 15
 if [ "$USE_GCC13" = y ]; then
     export USE_GCC13=y gcc_version=13