diff --git a/additions/camoucfg/MaskConfig.hpp b/additions/camoucfg/MaskConfig.hpp
index 76fc407..3e6370e 100644
--- a/additions/camoucfg/MaskConfig.hpp
+++ b/additions/camoucfg/MaskConfig.hpp
@@ -4,7 +4,6 @@ Written by daijro.
 */
 
 #pragma once
-
 #include "json.hpp"
 #include <memory>
 #include <string>
@@ -12,10 +11,12 @@ Written by daijro.
 #include <optional>
 #include <codecvt>
 #include "mozilla/glue/Debug.h"
-#include <stdlib.h>
-#include <stdio.h>
+#include <cstdlib>
+#include <cstdio>
 #include <variant>
 #include <cstddef>
+#include <vector>
+#include <algorithm>
 
 #ifdef _WIN32
 #  include <windows.h>
@@ -23,182 +24,188 @@ Written by daijro.
 
 namespace MaskConfig {
 
+// Function to get the value of an environment variable as a UTF-8 string.
 inline std::optional<std::string> get_env_utf8(const std::string& name) {
 #ifdef _WIN32
-  std::wstring wName(name.begin(), name.end());
-  DWORD size = GetEnvironmentVariableW(wName.c_str(), nullptr, 0);
-  if (size == 0) return std::nullopt;  // Environment variable not found
+    std::wstring wName(name.begin(), name.end());
+    DWORD size = GetEnvironmentVariableW(wName.c_str(), nullptr, 0);
+    if (size == 0) return std::nullopt;  // Environment variable not found
 
-  std::vector<wchar_t> buffer(size);
-  GetEnvironmentVariableW(wName.c_str(), buffer.data(), size);
-  std::wstring wValue(buffer.data());
+    std::vector<wchar_t> buffer(size);
+    GetEnvironmentVariableW(wName.c_str(), buffer.data(), size);
+    std::wstring wValue(buffer.data());
 
-  // Convert UTF-16 to UTF-8
-  std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
-  return converter.to_bytes(wValue);
+    // Convert UTF-16 to UTF-8
+    std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
+    return converter.to_bytes(wValue);
 #else
-  const char* value = getenv(name.c_str());
-  if (!value) return std::nullopt;
-  return std::string(value);
+    const char* value = std::getenv(name.c_str());
+    if (!value) return std::nullopt;
+    return std::string(value);
 #endif
 }
 
-inline const nlohmann::json& GetJson() {
-  static const nlohmann::json jsonConfig = []() {
+// Helper function to load and parse configuration from environment variables.
+namespace {
+nlohmann::json loadConfig() {
     std::string jsonString;
     int index = 1;
 
+    // Read environment variables CAMOU_CONFIG_1, CAMOU_CONFIG_2, ...
     while (true) {
-      std::string envName = "CAMOU_CONFIG_" + std::to_string(index);
-      auto partialConfig = get_env_utf8(envName);
-      if (!partialConfig) break;
-
-      jsonString += *partialConfig;
-      index++;
+        std::string envName = "CAMOU_CONFIG_" + std::to_string(index);
+        auto partialConfig = get_env_utf8(envName);
+        if (!partialConfig)
+            break;
+        jsonString += *partialConfig;
+        index++;
     }
 
+    // If the concatenated string is empty, try reading the original CAMOU_CONFIG variable.
     if (jsonString.empty()) {
-      // Check for the original CAMOU_CONFIG as fallback
-      auto originalConfig = get_env_utf8("CAMOU_CONFIG");
-      if (originalConfig) jsonString = *originalConfig;
+        auto originalConfig = get_env_utf8("CAMOU_CONFIG");
+        if (originalConfig)
+            jsonString = *originalConfig;
     }
 
-    if (jsonString.empty()) return nlohmann::json{};
+    // If no configuration is provided, return an empty JSON.
+    if (jsonString.empty()) {
+        return nlohmann::json{};
+    }
 
-    // Validate
+    // Validate JSON correctness.
     if (!nlohmann::json::accept(jsonString)) {
-      printf_stderr("ERROR: Invalid JSON passed to CAMOU_CONFIG!\n");
-      return nlohmann::json{};
+        printf_stderr("ERROR: Invalid JSON passed to CAMOU_CONFIG!\n");
+        return nlohmann::json{};
     }
 
-    nlohmann::json result = nlohmann::json::parse(jsonString);
-    return result;
-  }();
-  return jsonConfig;
+    return nlohmann::json::parse(jsonString);
+}
+}  // namespace
+
+// Global configuration cache, initialized only once.
+static const nlohmann::json g_jsonConfig = loadConfig();
+
+// Function returns a reference to the already parsed JSON.
+inline const nlohmann::json& GetJson() {
+    return g_jsonConfig;
 }
 
-inline bool HasKey(const std::string& key, nlohmann::json& data) {
-  // printf_stderr("Property: %s\n", key.c_str());
-  // printf_stderr("WARNING: Key not found: %s\n", key.c_str());
-  return data.contains(key);
+inline bool HasKey(const std::string& key, const nlohmann::json& data) {
+    return data.contains(key);
 }
 
 inline std::optional<std::string> GetString(const std::string& key) {
-  // printf_stderr("GetString: %s\n", key.c_str());
-  auto data = GetJson();
-  if (!HasKey(key, data)) return std::nullopt;
-  return std::make_optional(data[key].get<std::string>());
+    const auto& data = GetJson();
+    if (!HasKey(key, data)) return std::nullopt;
+    return data[key].get<std::string>();
 }
 
 inline std::vector<std::string> GetStringList(const std::string& key) {
-  std::vector<std::string> result;
-
-  auto data = GetJson();
-  if (!HasKey(key, data)) return {};
-  // Build vector
-  for (const auto& item : data[key]) {
-    result.push_back(item.get<std::string>());
-  }
-  return result;
+    std::vector<std::string> result;
+    const auto& data = GetJson();
+    if (!HasKey(key, data)) return {};
+    for (const auto& item : data[key]) {
+        result.push_back(item.get<std::string>());
+    }
+    return result;
 }
 
 inline std::vector<std::string> GetStringListLower(const std::string& key) {
-  std::vector<std::string> result = GetStringList(key);
-  for (auto& str : result) {
-    std::transform(str.begin(), str.end(), str.begin(),
-                   [](unsigned char c) { return std::tolower(c); });
-  }
-  return result;
+    std::vector<std::string> result = GetStringList(key);
+    for (auto& str : result) {
+        std::transform(str.begin(), str.end(), str.begin(),
+                       [](unsigned char c) { return std::tolower(c); });
+    }
+    return result;
 }
 
 template <typename T>
 inline std::optional<T> GetUintImpl(const std::string& key) {
-  auto data = GetJson();
-  if (!HasKey(key, data)) return std::nullopt;
-  if (data[key].is_number_unsigned())
-    return std::make_optional(data[key].get<T>());
-  printf_stderr("ERROR: Value for key '%s' is not an unsigned integer\n",
-                key.c_str());
-  return std::nullopt;
+    const auto& data = GetJson();
+    if (!HasKey(key, data)) return std::nullopt;
+    if (data[key].is_number_unsigned())
+        return data[key].get<T>();
+    printf_stderr("ERROR: Value for key '%s' is not an unsigned integer\n", key.c_str());
+    return std::nullopt;
 }
 
 inline std::optional<uint64_t> GetUint64(const std::string& key) {
-  return GetUintImpl<uint64_t>(key);
+    return GetUintImpl<uint64_t>(key);
 }
 
 inline std::optional<uint32_t> GetUint32(const std::string& key) {
-  return GetUintImpl<uint32_t>(key);
+    return GetUintImpl<uint32_t>(key);
 }
 
 inline std::optional<int32_t> GetInt32(const std::string& key) {
-  auto data = GetJson();
-  if (!HasKey(key, data)) return std::nullopt;
-  if (data[key].is_number_integer())
-    return std::make_optional(data[key].get<int32_t>());
-  printf_stderr("ERROR: Value for key '%s' is not an integer\n", key.c_str());
-  return std::nullopt;
+    const auto& data = GetJson();
+    if (!HasKey(key, data)) return std::nullopt;
+    if (data[key].is_number_integer())
+        return data[key].get<int32_t>();
+    printf_stderr("ERROR: Value for key '%s' is not an integer\n", key.c_str());
+    return std::nullopt;
 }
 
 inline std::optional<double> GetDouble(const std::string& key) {
-  auto data = GetJson();
-  if (!HasKey(key, data)) return std::nullopt;
-  if (data[key].is_number_float())
-    return std::make_optional(data[key].get<double>());
-  if (data[key].is_number_unsigned() || data[key].is_number_integer())
-    return std::make_optional(static_cast<double>(data[key].get<int64_t>()));
-  printf_stderr("ERROR: Value for key '%s' is not a double\n", key.c_str());
-  return std::nullopt;
+    const auto& data = GetJson();
+    if (!HasKey(key, data)) return std::nullopt;
+    if (data[key].is_number_float())
+        return data[key].get<double>();
+    if (data[key].is_number_unsigned() || data[key].is_number_integer())
+        return static_cast<double>(data[key].get<int64_t>());
+    printf_stderr("ERROR: Value for key '%s' is not a double\n", key.c_str());
+    return std::nullopt;
 }
 
 inline std::optional<bool> GetBool(const std::string& key) {
-  auto data = GetJson();
-  if (!HasKey(key, data)) return std::nullopt;
-  if (data[key].is_boolean()) return std::make_optional(data[key].get<bool>());
-  printf_stderr("ERROR: Value for key '%s' is not a boolean\n", key.c_str());
-  return std::nullopt;
+    const auto& data = GetJson();
+    if (!HasKey(key, data)) return std::nullopt;
+    if (data[key].is_boolean()) return data[key].get<bool>();
+    printf_stderr("ERROR: Value for key '%s' is not a boolean\n", key.c_str());
+    return std::nullopt;
 }
 
 inline bool CheckBool(const std::string& key) {
-  return GetBool(key).value_or(false);
+    return GetBool(key).value_or(false);
 }
 
-inline std::optional<std::array<uint32_t, 4>> GetRect(
-    const std::string& left, const std::string& top, const std::string& width,
-    const std::string& height) {
-  // Make top and left default to 0
-  std::array<std::optional<uint32_t>, 4> values = {
-      GetUint32(left).value_or(0), GetUint32(top).value_or(0), GetUint32(width),
-      GetUint32(height)};
+inline std::optional<std::array<uint32_t, 4>> GetRect(const std::string& left,
+                                                        const std::string& top,
+                                                        const std::string& width,
+                                                        const std::string& height) {
+    std::array<std::optional<uint32_t>, 4> values = {
+        GetUint32(left).value_or(0),
+        GetUint32(top).value_or(0),
+        GetUint32(width),
+        GetUint32(height)
+    };
 
-  // If height or width is std::nullopt, return std::nullopt
-  if (!values[2].has_value() || !values[3].has_value()) {
-    if (values[2].has_value() ^ values[3].has_value())
-      printf_stderr(
-          "Both %s and %s must be provided. Using default "
-          "behavior.\n",
-          height.c_str(), width.c_str());
-    return std::nullopt;
-  }
+    if (!values[2].has_value() || !values[3].has_value()) {
+        if (values[2].has_value() ^ values[3].has_value())
+            printf_stderr("Both %s and %s must be provided. Using default behavior.\n",
+                          height.c_str(), width.c_str());
+        return std::nullopt;
+    }
 
-  // Convert std::optional<uint32_t> to uint32_t
-  std::array<uint32_t, 4> result;
-  std::transform(values.begin(), values.end(), result.begin(),
-                 [](const auto& value) { return value.value(); });
+    std::array<uint32_t, 4> result;
+    std::transform(values.begin(), values.end(), result.begin(),
+                   [](const auto& value) { return value.value(); });
 
-  return result;
-}
-
-inline std::optional<std::array<int32_t, 4>> GetInt32Rect(
-    const std::string& left, const std::string& top, const std::string& width,
-    const std::string& height) {
-  // Calls GetRect but casts to int32_t
-  if (auto optValue = GetRect(left, top, width, height)) {
-    std::array<int32_t, 4> result;
-    std::transform(optValue->begin(), optValue->end(), result.begin(),
-                   [](const auto& val) { return static_cast<int32_t>(val); });
     return result;
-  }
-  return std::nullopt;
+}
+
+inline std::optional<std::array<int32_t, 4>> GetInt32Rect(const std::string& left,
+                                                            const std::string& top,
+                                                            const std::string& width,
+                                                            const std::string& height) {
+    if (auto optValue = GetRect(left, top, width, height)) {
+        std::array<int32_t, 4> result;
+        std::transform(optValue->begin(), optValue->end(), result.begin(),
+                       [](const auto& val) { return static_cast<int32_t>(val); });
+        return result;
+    }
+    return std::nullopt;
 }
 
 // Helpers for WebGL