diff --git a/api.php b/api.php
index 9bc5076..bcd6bb6 100644
--- a/api.php
+++ b/api.php
@@ -12,14 +12,27 @@ $autoloader->addPrefix("AirQuality", "logic");
 $autoloader->addPrefix("SBRL", "lib/SBRL");
 $autoloader->register();
 
+// 2: Settings
+$settings = new \SBRL\TomlConfig(
+	"data/settings.toml",
+	"settings.default.toml"
+);
+
 
 // 2: Dependency injection
 
 $di_builder = new DI\ContainerBuilder();
 $di_builder->addDefinitions("di_config.php");
-// TODO: In production, we should use something like this - see http://php-di.org/doc/container-configuration.html
-// $builder->enableCompilation(__DIR__ . '/tmp');
-// $builder->writeProxiesToFile(true, __DIR__ . '/tmp/proxies');
+if($settings->get("env.mode") == "production") {
+	// http://php-di.org/doc/container-configuration.html
+	if(!file_exists(ROOT_DIR."data/cache/php_di"))
+		mkdir(ROOT_DIR."data/cache/php_di", 0700);
+	$builder->enableCompilation(ROOT_DIR."data/cache/php_di");
+	
+	if(!file_exists(ROOT_DIR."data/cache/php_di_proxies"))
+		mkdir(ROOT_DIR."data/cache/php_di_proxies", 0700);
+	$builder->writeProxiesToFile(true, ROOT_DIR."data/cache/php_di_proxies");
+}
 
 $di_container = $di_builder->build();
 
diff --git a/di_config.php b/di_config.php
index 06cfdc5..bd9c444 100644
--- a/di_config.php
+++ b/di_config.php
@@ -16,11 +16,9 @@ return [
 	"settings.file_default" => "data/settings.toml",
 	"settings.file_custom" => "settings.default.toml",
 	
-	\SBRL\TomlConfig::class => function(ContainerInterface $c) {
-		return new TomlConfig(
-			$c->get("settings.file_default"),
-			$c->get("settings.file_custom")
-		);
+	TomlConfig::class => function(ContainerInterface $c) {
+		global $settings;
+		return $settings;
 	},
 	
 	IDeviceRepository::class => DI\autowire(MariaDBDeviceRepository::class),
diff --git a/settings.default.toml b/settings.default.toml
index 8e4a860..88dc50a 100644
--- a/settings.default.toml
+++ b/settings.default.toml
@@ -3,6 +3,10 @@
 # Your changes may be overwritten in a future update.
 # Instead, edit the custom configuration file located at "data/settings.toml".
 
+[env]
+# The operating mode. Can be either "development", or "production" (default; activates a number of optimisations which might make development harder, such as 3rd-party library caches)
+mode = "production"
+
 [database]
 # Settings that control the database, or the connection to it