diff --git a/Core/JSON/jsonProjectHandlers.lua b/Core/JSON/jsonProjectHandlers.lua
index 19b1cf0..dc78690 100644
--- a/Core/JSON/jsonProjectHandlers.lua
+++ b/Core/JSON/jsonProjectHandlers.lua
@@ -463,6 +463,7 @@ local function auBlockProjectKeyLtoNotMsvc(processor, value)
             --linkoptions "-Wl,-mllvm,-threads=4"
             buildoptions "-flto"
             linkoptions "-flto"
+            linkoptions "-O3"
         auFilter{}
     end
 end