diff --git a/src/markup/syntax/engine/PhutilDefaultSyntaxHighlighterEngine.php b/src/markup/syntax/engine/PhutilDefaultSyntaxHighlighterEngine.php
index 2b8d8dc..2a68801 100644
--- a/src/markup/syntax/engine/PhutilDefaultSyntaxHighlighterEngine.php
+++ b/src/markup/syntax/engine/PhutilDefaultSyntaxHighlighterEngine.php
@@ -1,98 +1,102 @@
 <?php
 
 final class PhutilDefaultSyntaxHighlighterEngine
   extends PhutilSyntaxHighlighterEngine {
 
   private $config = array();
 
   public function setConfig($key, $value) {
     $this->config[$key] = $value;
     return $this;
   }
 
   public function getLanguageFromFilename($filename) {
     static $default_map = array(
       // All files which have file extensions that we haven't already matched
       // map to their extensions.
       '@\\.([^./]+)$@' => 1,
     );
 
     $maps = array();
     if (!empty($this->config['filename.map'])) {
       $maps[] = $this->config['filename.map'];
     }
     $maps[] = $default_map;
 
     foreach ($maps as $map) {
       foreach ($map as $regexp => $lang) {
         $matches = null;
         if (preg_match($regexp, $filename, $matches)) {
           if (is_numeric($lang)) {
             return idx($matches, $lang);
           } else {
             return $lang;
           }
         }
       }
     }
 
     return null;
   }
 
   public function getHighlightFuture($language, $source) {
     if ($language === null) {
       $language = PhutilLanguageGuesser::guessLanguage($source);
     }
 
     $have_pygments = !empty($this->config['pygments.enabled']);
 
     if ($language == 'php' && PhutilXHPASTBinary::isAvailable()) {
       return id(new PhutilXHPASTSyntaxHighlighter())
         ->getHighlightFuture($source);
     }
 
     if ($language == 'console') {
       return id(new PhutilConsoleSyntaxHighlighter())
         ->getHighlightFuture($source);
     }
 
     if ($language == 'diviner' || $language == 'remarkup') {
       return id(new PhutilDivinerSyntaxHighlighter())
         ->getHighlightFuture($source);
     }
 
     if ($language == 'rainbow') {
       return id(new PhutilRainbowSyntaxHighlighter())
         ->getHighlightFuture($source);
     }
 
     if ($language == 'php') {
       return id(new PhutilLexerSyntaxHighlighter())
         ->setConfig('lexer', new PhutilPHPFragmentLexer())
         ->setConfig('language', 'php')
         ->getHighlightFuture($source);
     }
 
     if ($language == 'py') {
       return id(new PhutilLexerSyntaxHighlighter())
         ->setConfig('lexer', new PhutilPythonFragmentLexer())
         ->setConfig('language', 'py')
         ->getHighlightFuture($source);
     }
 
     if ($language == 'invisible') {
       return id(new PhutilInvisibleSyntaxHighlighter())
              ->getHighlightFuture($source);
     }
 
-    if ($have_pygments) {
-      return id(new PhutilPygmentsSyntaxHighlighter())
-        ->setConfig('language', $language)
-        ->getHighlightFuture($source);
+    // Don't invoke Pygments for plain text, since it's expensive and has
+    // no effect.
+    if ($language !== 'text' && $language !== 'txt') {
+      if ($have_pygments) {
+        return id(new PhutilPygmentsSyntaxHighlighter())
+          ->setConfig('language', $language)
+          ->getHighlightFuture($source);
+      }
     }
 
     return id(new PhutilDefaultSyntaxHighlighter())
       ->getHighlightFuture($source);
   }
 
 }