diff --git a/runelite-client/src/main/java/net/runelite/client/config/ConfigInvocationHandler.java b/runelite-client/src/main/java/net/runelite/client/config/ConfigInvocationHandler.java
index f2aa57ff3e..f6375b0bb8 100644
--- a/runelite-client/src/main/java/net/runelite/client/config/ConfigInvocationHandler.java
+++ b/runelite-client/src/main/java/net/runelite/client/config/ConfigInvocationHandler.java
@@ -24,6 +24,8 @@
  */
 package net.runelite.client.config;
 
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
 import java.lang.invoke.MethodHandles;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationHandler;
@@ -34,9 +36,15 @@ import lombok.extern.slf4j.Slf4j;
 @Slf4j
 class ConfigInvocationHandler implements InvocationHandler
 {
-	private final ConfigManager manager;
+	// Special object to represent null values in the cache
+	private static final Object NULL = new Object();
 
-	public ConfigInvocationHandler(ConfigManager manager)
+	private final ConfigManager manager;
+	private final Cache<Method, Object> cache = CacheBuilder.newBuilder()
+		.maximumSize(128)
+		.build();
+
+	ConfigInvocationHandler(ConfigManager manager)
 	{
 		this.manager = manager;
 	}
@@ -44,6 +52,16 @@ class ConfigInvocationHandler implements InvocationHandler
 	@Override
 	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
 	{
+		// Use cached configuration value if available
+		if (args == null)
+		{
+			Object cachedValue = cache.getIfPresent(method);
+			if (cachedValue != null)
+			{
+				return cachedValue == NULL ? null : cachedValue;
+			}
+		}
+
 		Class<?> iface = proxy.getClass().getInterfaces()[0];
 
 		ConfigGroup group = iface.getAnnotation(ConfigGroup.class);
@@ -63,6 +81,8 @@ class ConfigInvocationHandler implements InvocationHandler
 
 		if (args == null)
 		{
+			log.trace("cache miss (size: {}, group: {}, key: {})", cache.size(), group.value(), item.keyName());
+
 			// Getting configuration item
 			String value = manager.getConfiguration(group.value(), item.keyName());
 
@@ -70,9 +90,12 @@ class ConfigInvocationHandler implements InvocationHandler
 			{
 				if (method.isDefault())
 				{
-					return callDefaultMethod(proxy, method, null);
+					Object defaultValue = callDefaultMethod(proxy, method, null);
+					cache.put(method, defaultValue == null ? NULL : defaultValue);
+					return defaultValue;
 				}
 
+				cache.put(method, NULL);
 				return null;
 			}
 
@@ -81,7 +104,9 @@ class ConfigInvocationHandler implements InvocationHandler
 			
 			try
 			{
-				return ConfigManager.stringToObject(value, returnType);
+				Object objectValue = ConfigManager.stringToObject(value, returnType);
+				cache.put(method, objectValue == null ? NULL : objectValue);
+				return objectValue;
 			}
 			catch (Exception e)
 			{
@@ -150,4 +175,10 @@ class ConfigInvocationHandler implements InvocationHandler
 			.bindTo(proxy)
 			.invokeWithArguments(args);
 	}
+
+	void invalidate()
+	{
+		log.trace("cache invalidate");
+		cache.invalidateAll();
+	}
 }
diff --git a/runelite-client/src/main/java/net/runelite/client/config/ConfigManager.java b/runelite-client/src/main/java/net/runelite/client/config/ConfigManager.java
index 8ff9434069..4e6c1e65ae 100644
--- a/runelite-client/src/main/java/net/runelite/client/config/ConfigManager.java
+++ b/runelite-client/src/main/java/net/runelite/client/config/ConfigManager.java
@@ -167,6 +167,7 @@ public class ConfigManager
 			return;
 		}
 
+		handler.invalidate();
 		properties.clear();
 
 		for (ConfigEntry entry : configuration.getConfig())
@@ -275,6 +276,7 @@ public class ConfigManager
 
 	private synchronized void loadFromFile()
 	{
+		handler.invalidate();
 		properties.clear();
 
 		try (FileInputStream in = new FileInputStream(propertiesFile))
@@ -391,6 +393,7 @@ public class ConfigManager
 		}
 
 		log.debug("Setting configuration value for {}.{} to {}", groupName, key, value);
+		handler.invalidate();
 
 		synchronized (pendingChanges)
 		{
@@ -421,6 +424,7 @@ public class ConfigManager
 		}
 
 		log.debug("Unsetting configuration value for {}.{}", groupName, key);
+		handler.invalidate();
 
 		synchronized (pendingChanges)
 		{