diff --git a/package.yaml b/package.yaml
index e9f2bc28c7..e49c0deff0 100644
--- a/package.yaml
+++ b/package.yaml
@@ -74,6 +74,7 @@ when:
 
 library:
   source-dirs: src
+  ghc-options: -O2
 
 executables:
   simplex-chat:
diff --git a/simplex-chat.cabal b/simplex-chat.cabal
index 27aab2be9f..9acf570213 100644
--- a/simplex-chat.cabal
+++ b/simplex-chat.cabal
@@ -181,7 +181,7 @@ library
       Paths_simplex_chat
   hs-source-dirs:
       src
-  ghc-options: -Wall -Wcompat -Werror=incomplete-patterns -Wredundant-constraints -Wincomplete-record-updates -Wincomplete-uni-patterns -Wunused-type-patterns
+  ghc-options: -Wall -Wcompat -Werror=incomplete-patterns -Wredundant-constraints -Wincomplete-record-updates -Wincomplete-uni-patterns -Wunused-type-patterns -O2
   build-depends:
       aeson ==2.2.*
     , ansi-terminal >=0.10 && <0.12