diff --git a/CMakeLists.txt b/CMakeLists.txt
index de3e41e15a..25941468c9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -114,6 +114,32 @@ if(CCACHE_FOUND)
     set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
 endif(CCACHE_FOUND)
 
+# Precompiled headers (opt-in, default OFF). When ON, the heaviest libraries
+# (chain, protocol, wallet) precompile a curated set of stable third-party
+# headers (Boost.MultiIndex, FC reflection/serialization, std) once per target
+# instead of re-parsing them in every translation unit. See each library's
+# pch.hpp for the header list and rationale.
+#
+# Left OFF by default so it cannot affect existing/CI builds until a maintainer
+# opts in and measures. If ccache is in use, PCH only helps when ccache is told
+# not to hash the (large, stable) PCH timestamp: export
+#   CCACHE_SLOPPINESS=pch_defines,time_macros
+# before building, otherwise ccache conservatively disables its own cache for
+# PCH-using compilations and you lose the ccache win without gaining the PCH one.
+option(ENABLE_PCH "Enable precompiled headers for heavy libraries" OFF)
+if(ENABLE_PCH)
+    message(STATUS "ENABLE_PCH: ON (precompiling stable third-party headers for chain/protocol/wallet)")
+    if(CCACHE_FOUND AND NOT "$ENV{CCACHE_SLOPPINESS}" MATCHES "pch_defines")
+        message(WARNING
+            "ENABLE_PCH is ON and ccache is active, but CCACHE_SLOPPINESS does not "
+            "include pch_defines,time_macros. ccache will likely disable caching for "
+            "PCH-using compilations. Export "
+            "CCACHE_SLOPPINESS=pch_defines,time_macros before building.")
+    endif()
+else()
+    message(STATUS "ENABLE_PCH: OFF")
+endif()
+
 if(WIN32)
 
     message(STATUS "Configuring VIZ on WIN32")
diff --git a/libraries/chain/CMakeLists.txt b/libraries/chain/CMakeLists.txt
index b4c8d3aa18..86b9f6d3d2 100644
--- a/libraries/chain/CMakeLists.txt
+++ b/libraries/chain/CMakeLists.txt
@@ -154,6 +154,10 @@ add_dependencies(graphene_chain graphene_protocol graphene_utilities build_hardf
 target_link_libraries(graphene_chain graphene_protocol graphene_utilities fc chainbase appbase ${PATCH_MERGE_LIB})
 target_include_directories(graphene_chain PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include" "${CMAKE_CURRENT_BINARY_DIR}/include" "${CMAKE_CURRENT_SOURCE_DIR}/../../")
 
+if(ENABLE_PCH)
+    target_precompile_headers(graphene_chain PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/pch.hpp")
+endif()
+
 if(WITH_COVERAGE)
     target_compile_options(graphene_chain PRIVATE --coverage)
     target_link_options(graphene_chain PUBLIC --coverage)
diff --git a/libraries/chain/pch.hpp b/libraries/chain/pch.hpp
new file mode 100644
index 0000000000..23de8af663
--- /dev/null
+++ b/libraries/chain/pch.hpp
@@ -0,0 +1,41 @@
+// Precompiled header for graphene_chain.
+//
+// Opt-in via -DENABLE_PCH=ON. Lists only *stable* third-party headers (Boost,
+// FC, C++ standard library) that are pulled in — directly or transitively — by
+// most translation units in this library. Project headers are intentionally
+// excluded: they change often, and putting a churning header in the PCH forces
+// a full-library rebuild on every edit, defeating the purpose.
+//
+// Chosen from an include-frequency scan of libraries/chain/*.{hpp,cpp}; the
+// dominant cost here is Boost.MultiIndex plus FC serialization/reflection.
+#pragma once
+
+// Boost.MultiIndex — the chainbase object indexes instantiate these heavily.
+#include <boost/multi_index_container.hpp>
+#include <boost/multi_index/ordered_index.hpp>
+#include <boost/multi_index/hashed_index.hpp>
+#include <boost/multi_index/composite_key.hpp>
+#include <boost/multi_index/member.hpp>
+#include <boost/multi_index/mem_fun.hpp>
+
+// Boost misc used across the library.
+#include <boost/interprocess/containers/flat_set.hpp>
+#include <boost/filesystem.hpp>
+
+// FC framework — serialization, reflection, exceptions, primitives.
+#include <fc/exception/exception.hpp>
+#include <fc/reflect/reflect.hpp>
+#include <fc/io/raw.hpp>
+#include <fc/io/datastream.hpp>
+#include <fc/variant.hpp>
+#include <fc/uint128_t.hpp>
+#include <fc/filesystem.hpp>
+
+// C++ standard library.
+#include <algorithm>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <map>
+#include <set>
+#include <memory>
diff --git a/libraries/protocol/CMakeLists.txt b/libraries/protocol/CMakeLists.txt
index b35c204b2b..ea1a513a68 100644
--- a/libraries/protocol/CMakeLists.txt
+++ b/libraries/protocol/CMakeLists.txt
@@ -56,6 +56,10 @@ target_link_libraries(graphene_${CURRENT_TARGET} fc)
 target_include_directories(graphene_${CURRENT_TARGET}
         PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include" "${CMAKE_CURRENT_BINARY_DIR}/include")
 
+if(ENABLE_PCH)
+    target_precompile_headers(graphene_${CURRENT_TARGET} PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/pch.hpp")
+endif()
+
 if(WITH_COVERAGE)
     target_compile_options(graphene_${CURRENT_TARGET} PRIVATE --coverage)
     target_link_options(graphene_${CURRENT_TARGET} PUBLIC --coverage)
diff --git a/libraries/protocol/pch.hpp b/libraries/protocol/pch.hpp
new file mode 100644
index 0000000000..82094de261
--- /dev/null
+++ b/libraries/protocol/pch.hpp
@@ -0,0 +1,28 @@
+// Precompiled header for graphene_protocol.
+//
+// Opt-in via -DENABLE_PCH=ON. See libraries/chain/pch.hpp for the rationale:
+// only stable third-party headers, no project headers. Selected from an
+// include-frequency scan of libraries/protocol/*.{hpp,cpp}; the dominant cost
+// here is FC reflection / static_variant plus the operation type machinery.
+#pragma once
+
+// FC framework — reflection, serialization, primitives, crypto.
+#include <fc/reflect/reflect.hpp>
+#include <fc/reflect/variant.hpp>
+#include <fc/static_variant.hpp>
+#include <fc/exception/exception.hpp>
+#include <fc/io/raw.hpp>
+#include <fc/io/varint.hpp>
+#include <fc/string.hpp>
+#include <fc/time.hpp>
+#include <fc/optional.hpp>
+#include <fc/smart_ref_impl.hpp>
+#include <fc/utf8.hpp>
+#include <fc/bitutil.hpp>
+
+// C++ standard library.
+#include <string>
+#include <vector>
+#include <map>
+#include <set>
+#include <memory>
diff --git a/libraries/wallet/CMakeLists.txt b/libraries/wallet/CMakeLists.txt
index b1c42f093d..9ceaf4cf6c 100644
--- a/libraries/wallet/CMakeLists.txt
+++ b/libraries/wallet/CMakeLists.txt
@@ -50,6 +50,10 @@ target_link_libraries(
 )
 target_include_directories( graphene_${CURRENT_TARGET} PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include")
 
+if(ENABLE_PCH)
+    target_precompile_headers(graphene_${CURRENT_TARGET} PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/pch.hpp")
+endif()
+
 if(MSVC)
     set_source_files_properties(wallet.cpp PROPERTIES COMPILE_FLAGS "/bigobj")
 endif(MSVC)
diff --git a/libraries/wallet/pch.hpp b/libraries/wallet/pch.hpp
new file mode 100644
index 0000000000..c887e888c4
--- /dev/null
+++ b/libraries/wallet/pch.hpp
@@ -0,0 +1,34 @@
+// Precompiled header for graphene_wallet.
+//
+// Opt-in via -DENABLE_PCH=ON. See libraries/chain/pch.hpp for the rationale:
+// only stable third-party headers, no project headers. Selected from an
+// include-frequency scan of libraries/wallet/*.{hpp,cpp}; the cost here is
+// Boost.MultiIndex, Boost.Range/algorithm, and FC's api/reflection headers.
+#pragma once
+
+// Boost.MultiIndex.
+#include <boost/multi_index_container.hpp>
+#include <boost/multi_index/ordered_index.hpp>
+#include <boost/multi_index/member.hpp>
+#include <boost/multi_index/mem_fun.hpp>
+
+// Boost string / range algorithms used through the wallet.
+#include <boost/algorithm/string.hpp>
+#include <boost/range/adaptor/map.hpp>
+#include <boost/lexical_cast.hpp>
+
+// FC framework.
+#include <fc/api.hpp>
+#include <fc/macros.hpp>
+#include <fc/exception/exception.hpp>
+#include <fc/crypto/base58.hpp>
+
+// C++ standard library.
+#include <algorithm>
+#include <string>
+#include <vector>
+#include <map>
+#include <list>
+#include <sstream>
+#include <iostream>
+#include <iterator>