diff --git a/src/core/group/group.h b/src/core/group/group.h
index e3139b8..671ac84 100644
--- a/src/core/group/group.h
+++ b/src/core/group/group.h
@@ -457,6 +457,10 @@ public:
     /// Execute the build process without blocking.
     static void build_async(Executor &&executor, Notifier &&callback);
 
+    static bool is_fast_mode() {
+        return fast_;
+    }
+
     // ------------------------------------------------------------------------------------- //
 
     /// Get the CommonCode from CaseInfo.
diff --git a/src/core_ffi/python_ffi/CMakeLists.txt b/src/core_ffi/python_ffi/CMakeLists.txt
index 18ebc0e..c15f75f 100644
--- a/src/core_ffi/python_ffi/CMakeLists.txt
+++ b/src/core_ffi/python_ffi/CMakeLists.txt
@@ -18,6 +18,7 @@ set(KLSK_PYTHON_FFI_SRC
     wrapper/group_union.cc
     wrapper/group.cc
     wrapper/fast_cal.cc
+    wrapper/speed_up.cc
 )
 
 pybind11_add_module(klotski_py ${KLSK_PYTHON_FFI_SRC})
diff --git a/src/core_ffi/python_ffi/binder/klsk_code.cc b/src/core_ffi/python_ffi/binder/klsk_code.cc
index cdb65c4..4b3e1f5 100644
--- a/src/core_ffi/python_ffi/binder/klsk_code.cc
+++ b/src/core_ffi/python_ffi/binder/klsk_code.cc
@@ -1,5 +1,6 @@
 #include <pybind11/stl.h>
 #include <pybind11/operators.h>
+#include <py_ffi/speed_up.h>
 
 #include "binder.h"
 #include "py_ffi/layout.h"
@@ -7,8 +8,19 @@
 
 using klotski::ffi::PyBlock;
 using klotski::ffi::PyLayout;
+using klotski::ffi::PySpeedUp;
 using klotski::ffi::PyShortCode;
 
+static void bind_speed_up(const py::module_ &mod) {
+    py::class_<PySpeedUp>(mod, "SpeedUp")
+        .def_static("build_stage_0", &PySpeedUp::stage_0)
+        .def_static("build_stage_1", &PySpeedUp::stage_1)
+        .def_static("build_stage_2", &PySpeedUp::stage_2)
+        .def_property_readonly_static("is_stage_0", [](const py::object&) { return PySpeedUp::is_stage_0(); })
+        .def_property_readonly_static("is_stage_1", [](const py::object&) { return PySpeedUp::is_stage_1(); })
+        .def_property_readonly_static("is_stage_2", [](const py::object&) { return PySpeedUp::is_stage_2(); });
+}
+
 static void bind_layout(const py::module_ &mod) {
     py::enum_<PyBlock>(mod, "Block")
         .value("SPACE", PyBlock::SPACE)
@@ -16,8 +28,7 @@ static void bind_layout(const py::module_ &mod) {
         .value("B_1x2", PyBlock::B_1x2)
         .value("B_2x1", PyBlock::B_2x1)
         .value("B_2x2", PyBlock::B_2x2)
-        .value("FILL", PyBlock::FILL)
-        .export_values();
+        .value("FILL", PyBlock::FILL);
 
     py::class_<PyLayout>(mod, "Layout")
         .def(py::init<uint64_t>())
@@ -73,12 +84,11 @@ static void bind_short_code(const py::module_ &mod) {
         .def("to_layout", &PyShortCode::layout)
 
         .def_static("check", py::overload_cast<uint32_t>(&PyShortCode::check))
-        .def_static("check", py::overload_cast<std::string_view>(&PyShortCode::check))
-
-        .def_static("speed_up", &PyShortCode::speed_up, py::arg("fast_mode") = false);
+        .def_static("check", py::overload_cast<std::string_view>(&PyShortCode::check));
 }
 
 void bind_klsk_code(const py::module_ &mod) {
     bind_layout(mod);
     bind_short_code(mod);
+    bind_speed_up(mod);
 }
diff --git a/src/core_ffi/python_ffi/include/py_ffi/short_code.h b/src/core_ffi/python_ffi/include/py_ffi/short_code.h
index d33217e..925ab41 100644
--- a/src/core_ffi/python_ffi/include/py_ffi/short_code.h
+++ b/src/core_ffi/python_ffi/include/py_ffi/short_code.h
@@ -49,11 +49,6 @@ public:
 
     // ------------------------------------------------------------------------------------- //
 
-    /// Build conversion index for ShortCode.
-    static void speed_up(const bool fast_mode) { // TODO: move to `SpeedUp`
-        codec::ShortCode::speed_up(fast_mode);
-    }
-
 private:
     codec::ShortCode code_;
 };
diff --git a/src/core_ffi/python_ffi/include/py_ffi/speed_up.h b/src/core_ffi/python_ffi/include/py_ffi/speed_up.h
new file mode 100644
index 0000000..d3cec35
--- /dev/null
+++ b/src/core_ffi/python_ffi/include/py_ffi/speed_up.h
@@ -0,0 +1,26 @@
+/// Klotski Engine Python FFI by Dnomd343 @2024
+
+#pragma once
+
+namespace klotski::ffi {
+
+// TODO: add multi-thread support
+
+// TODO: add `__await__` interface support
+
+class PySpeedUp {
+public:
+    static void stage_0();
+
+    static void stage_1();
+
+    static void stage_2();
+
+    static bool is_stage_0();
+
+    static bool is_stage_1();
+
+    static bool is_stage_2();
+};
+
+} // namespace klotski::ffi
diff --git a/src/core_ffi/python_ffi/wrapper/speed_up.cc b/src/core_ffi/python_ffi/wrapper/speed_up.cc
new file mode 100644
index 0000000..0979207
--- /dev/null
+++ b/src/core_ffi/python_ffi/wrapper/speed_up.cc
@@ -0,0 +1,35 @@
+#include "py_ffi/speed_up.h"
+
+#include <group/group.h>
+#include <all_cases/all_cases.h>
+
+using klotski::ffi::PySpeedUp;
+
+using klotski::cases::AllCases;
+using klotski::cases::BasicRanges;
+
+using klotski::group::GroupCases;
+
+void PySpeedUp::stage_0() {
+    BasicRanges::instance().build();
+}
+
+void PySpeedUp::stage_1() {
+    AllCases::instance().build();
+}
+
+void PySpeedUp::stage_2() {
+    GroupCases::build();
+}
+
+bool PySpeedUp::is_stage_0() {
+    return BasicRanges::instance().is_available();
+}
+
+bool PySpeedUp::is_stage_1() {
+    return AllCases::instance().is_available();
+}
+
+bool PySpeedUp::is_stage_2() {
+    return GroupCases::is_fast_mode();
+}