diff --git a/CMakeLists.txt b/CMakeLists.txt
index bac46c2bc..5ef0f5573 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,8 +5,8 @@
 # This file sets all the variables shared between the projects
 # like the installation path, compilation flags etc..
 
-# cmake 3.16 is required if using qt6
-cmake_minimum_required(VERSION 3.10)
+# 3.16 required for Qt6 and target_precompile_headers()
+cmake_minimum_required(VERSION 3.16)
 
 # Use compiler cache (ccache)
 option(USE_CCACHE "Cache the build results with ccache" OFF)
@@ -184,6 +184,9 @@ elseif(CMAKE_COMPILER_IS_GNUCXX)
       set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${FLAG}")
     endif()
   endforeach()
+
+  # Reduce compiler I/O by using pipes between stages instead of temp files
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pipe")
 else()
   # other: osx/llvm, bsd/llvm
   set(CMAKE_CXX_FLAGS_RELEASE "-O2")
@@ -192,6 +195,9 @@ else()
   else()
     set(CMAKE_CXX_FLAGS_DEBUG "-g -O0 -Wall -Wextra")
   endif()
+
+  # Reduce compiler I/O by using pipes between stages instead of temp files
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pipe")
 endif()
 
 # GNU systems need to define the Mersenne exponent for the RNG to compile w/o warning
diff --git a/libcockatrice_protocol/libcockatrice/protocol/pb/CMakeLists.txt b/libcockatrice_protocol/libcockatrice/protocol/pb/CMakeLists.txt
index 3a193ae3c..f22828f46 100644
--- a/libcockatrice_protocol/libcockatrice/protocol/pb/CMakeLists.txt
+++ b/libcockatrice_protocol/libcockatrice/protocol/pb/CMakeLists.txt
@@ -90,7 +90,6 @@ set(PROTO_FILES
     event_game_log_notice.proto
     event_game_say.proto
     event_game_state_changed.proto
-    event_game_state_changed.proto
     event_join.proto
     event_join_room.proto
     event_kicked.proto