diff --git a/cache/.gitignore b/cache/.gitignore
new file mode 100644
index 0000000..00f63ad
--- /dev/null
+++ b/cache/.gitignore
@@ -0,0 +1,3 @@
+# This directory is used to cache fusion as PNG files
+# This way, they are only generated once, saving CPU and RAM on the server, at the expense of disk space
+# Remember to delete the corresponding fusions in this directory if you make any change to an image in the /ponies directory, otherwise the changes won't be reflected
diff --git a/fusion.php b/fusion.php
index f205c1b..540b14e 100644
--- a/fusion.php
+++ b/fusion.php
@@ -1,55 +1,82 @@
 <?php
-$debug = FALSE;
-
-include("ponies.php");
-
-$getFrom = $_GET["from"];
-$getTo = $_GET["to"];
-
-if(!isset($ponies[$getFrom]) || !isset($ponies[$getTo]))
-    die("Invalid combination");
-
-$from = imagecreatefrompng("./ponies/" . $ponies[$getFrom]["filename"]);
-$to = imagecreatefrompng("./ponies/" . $ponies[$getTo]["filename"]);
-
-for($i = 0; $i < imagecolorstotal($from); $i++)
+function makeFusion($getFrom, $getTo, $fromCli)
 {
-    if($i < imagecolorstotal($to) && $i <= 16)
+    $debug = FALSE;
+
+    include("ponies.php");
+
+    if(!isset($ponies[$getFrom]) || !isset($ponies[$getTo]))
+        die("Invalid combination");
+
+    $cacheFilename = "./cache/" . $getFrom . "_" . $getTo . ".png";
+    $cacheUrl = "/cache/" . $getFrom . "_" . $getTo . ".png";
+    $useCache = TRUE;
+
+    // If this fusion was already cached, just redirect to it.
+    if($useCache && file_exists($cacheFilename))
     {
-        $colorFrom = imagecolorsforindex($to, $i);
-        if($debug)
+        if($fromCli === FALSE)
         {
-            $colorTo = imagecolorsforindex($from, $i);
-            echo "$i\n";
-            print_r($colorFrom);
-            print_r($colorTo);
-            echo "\n";
+            header("Location: " . $cacheUrl);
         }
 
-        if($getFrom == $getTo)
+        return;
+    }
+
+    $from = imagecreatefrompng("./ponies/" . $ponies[$getFrom]["filename"]);
+    $to = imagecreatefrompng("./ponies/" . $ponies[$getTo]["filename"]);
+
+    for($i = 0; $i < imagecolorstotal($from); $i++)
+    {
+        if($i < imagecolorstotal($to) && $i <= 16)
         {
-            imagecolorset($from, $i, 255 - $colorFrom["red"], 255 - $colorFrom["green"], 255 - $colorFrom["blue"], $colorFrom["alpha"]);
-        }
-        else
-        {
-            imagecolorset($from, $i, $colorFrom["red"], $colorFrom["green"], $colorFrom["blue"], $colorFrom["alpha"]);
+            $colorFrom = imagecolorsforindex($to, $i);
+            if($debug)
+            {
+                $colorTo = imagecolorsforindex($from, $i);
+                echo "$i\n";
+                print_r($colorFrom);
+                print_r($colorTo);
+                echo "\n";
+            }
+
+            if($getFrom == $getTo)
+            {
+                imagecolorset($from, $i, 255 - $colorFrom["red"], 255 - $colorFrom["green"], 255 - $colorFrom["blue"], $colorFrom["alpha"]);
+            }
+            else
+            {
+                imagecolorset($from, $i, $colorFrom["red"], $colorFrom["green"], $colorFrom["blue"], $colorFrom["alpha"]);
+            }
         }
     }
+
+    // Retain transparency
+    imagealphablending($from, false);
+    imagesavealpha($from, true);
+    imagefill($from, 0, 0, imagecolorallocatealpha($from, 255, 255, 255, 127));
+
+    // Crop 1px from bottom to avoid showing swatch
+    $from = imagecrop($from, ['x' => 0, 'y' => 0, 'width' => imagesx($from), 'height' => imagesy($from) - 1]);
+
+    if(!$debug && !$fromCli)
+    {
+        header('Content-Type: image/png');
+        imagepng($from);
+    }
+
+    // Save fusion to cache
+    imagepng($from, $cacheFilename);
+
+    imagedestroy($to);
 }
 
-// Retain transparency
-imagealphablending($from, false);
-imagesavealpha($from, true);
-imagefill($from, 0, 0, imagecolorallocatealpha($from, 255, 255, 255, 127));
-
-// Crop 1px from bottom to avoid showing swatch
-$from = imagecrop($from, ['x' => 0, 'y' => 0, 'width' => imagesx($from), 'height' => imagesy($from) - 1]);
-
-if(!$debug)
+// Don't run the function if we're running from the command line
+if (php_sapi_name() !== 'cli')
 {
-    header('Content-Type: image/png');
-    imagepng($from);
+    $getFrom = $_GET["from"];
+    $getTo = $_GET["to"];
+    makeFusion($getFrom, $getTo, FALSE);
 }
 
-imagedestroy($to);
 ?>
\ No newline at end of file
diff --git a/generate_all.php b/generate_all.php
new file mode 100644
index 0000000..b77e3df
--- /dev/null
+++ b/generate_all.php
@@ -0,0 +1,42 @@
+<?php
+// Use this script to generate a cache of all the fusions. For security reasons this can only be done through the command line.
+// If you want to regenerate a fusion already in the cache, delete it from the cache first. This script will not generate a fusion that's already cached.
+// There is a small pause between each fusion in order to not overload the server. Depending on the number of ponies, this may take a while to run.
+
+if(php_sapi_name() !== 'cli')
+{
+    exit('You cannot run this script in your browser.');
+}
+
+require("ponies.php");
+require("fusion.php");
+
+$totalPonies = 0;
+
+foreach($ponies as $id => $properties)
+{
+    if(strpos($id, "break") === FALSE)
+        $totalPonies++;
+}
+
+$totalFusions = $totalPonies * $totalPonies;
+
+$i = 0;
+foreach($ponies as $id => $properties)
+{
+    if(strpos($id, "break") === FALSE)
+    {
+        foreach($ponies as $idSecond => $propertiesSecond)
+        {
+            if(strpos($idSecond, "break") === FALSE)
+            {
+                $i++;
+                $percentage = sprintf("%3d", floor(($i / $totalFusions) * 100));
+                echo "($percentage%) [$i/$totalFusions] $id + $idSecond\n";
+                makeFusion($id, $idSecond, TRUE);
+                sleep(1);
+            }
+        }
+    }
+}
+?>
\ No newline at end of file