diff --git a/src/main/java/com/garbagemule/MobArena/util/config/ConfigUtils.java b/src/main/java/com/garbagemule/MobArena/util/config/ConfigUtils.java
index 183eb30..776183a 100644
--- a/src/main/java/com/garbagemule/MobArena/util/config/ConfigUtils.java
+++ b/src/main/java/com/garbagemule/MobArena/util/config/ConfigUtils.java
@@ -4,19 +4,26 @@ import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.World;
 import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.configuration.InvalidConfigurationException;
 import org.bukkit.configuration.file.FileConfiguration;
 import org.bukkit.configuration.file.YamlConfiguration;
 import org.bukkit.plugin.Plugin;
 
 import java.io.File;
+import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.text.DecimalFormat;
 import java.text.DecimalFormatSymbols;
+import java.util.HashMap;
 import java.util.Locale;
+import java.util.Map;
+import java.util.Scanner;
 import java.util.Set;
 
 public class ConfigUtils
 {
+    private static Map<String, YamlConfiguration> resourceCache = new HashMap<>();
+
     public static void addIfEmpty(Plugin plugin, String resource, ConfigurationSection section) {
         process(plugin, resource, section, true, false);
     }
@@ -35,32 +42,50 @@ public class ConfigUtils
     }
 
     private static void process(Plugin plugin, String resource, ConfigurationSection section, boolean addOnlyIfEmpty, boolean removeObsolete) {
-        try {
-            YamlConfiguration defaults = new YamlConfiguration();
-            defaults.load(new InputStreamReader(plugin.getResource("res/" + resource)));
+        YamlConfiguration defaults = resourceCache.computeIfAbsent(resource, res -> {
+            InputStream is = plugin.getResource("res/" + res);
+            if (is == null) {
+                throw new IllegalStateException("Couldn't read " + res + " from jar, please re-install MobArena");
+            }
+            Scanner scanner = new Scanner(is).useDelimiter("\\A");
+            if (!scanner.hasNext()) {
+                throw new IllegalStateException("No content in " + res + " in jar, please re-install MobArena");
+            }
+            String contents = scanner.next();
+            YamlConfiguration yaml = new YamlConfiguration();
+            try {
+                yaml.loadFromString(contents);
+                return yaml;
+            } catch (InvalidConfigurationException e) {
+                throw new IllegalStateException("Invalid contents in " + res + " in jar, please re-install MobArena", e);
+            }
+        });
 
-            process(defaults, section, addOnlyIfEmpty, removeObsolete);
+        boolean modified = process(defaults, section, addOnlyIfEmpty, removeObsolete);
+        if (modified) {
             plugin.saveConfig();
-        } catch (Exception e) {
-            e.printStackTrace();
         }
     }
 
-    private static void process(YamlConfiguration defaults, ConfigurationSection section, boolean addOnlyIfEmpty, boolean removeObsolete) {
+    private static boolean process(YamlConfiguration defaults, ConfigurationSection section, boolean addOnlyIfEmpty, boolean removeObsolete) {
+        boolean modified = false;
         Set<String> present = section.getKeys(true);
         Set<String> required = defaults.getKeys(true);
         if (!addOnlyIfEmpty || present.isEmpty()) {
             for (String req : required) {
                 if (!present.remove(req)) {
                     section.set(req, defaults.get(req));
+                    modified = true;
                 }
             }
         }
         if (removeObsolete) {
             for (String obs : present) {
                 section.set(obs, null);
+                modified = true;
             }
         }
+        return modified;
     }
 
     public static ConfigurationSection makeSection(ConfigurationSection config, String section) {