diff --git a/src/IDF/Scm/Git.php b/src/IDF/Scm/Git.php
index 3ddaf5b..c512d4f 100644
--- a/src/IDF/Scm/Git.php
+++ b/src/IDF/Scm/Git.php
@@ -287,15 +287,12 @@ class IDF_Scm_Git
     }
 
     /**
-     * Get commit size.
-     *
-     * Get the sum of all the added/removed lines and the number of
-     * affected files.
+     * Check if a commit is big.
      *
      * @param string Commit ('HEAD')
-     * @return array array(added, removed, affected)
+     * @return bool The commit is big
      */
-    public function getCommitSize($commit='HEAD')
+    public function isCommitLarge($commit='HEAD')
     {
         $cmd = sprintf('GIT_DIR=%s git log --numstat -1 --pretty=format:%s %s',
                        escapeshellarg($this->repo), 
@@ -316,7 +313,7 @@ class IDF_Scm_Git
             $added+=$a;
             $removed+=$r;
         }
-        return array($added, $removed, $affected);
+        return ($affected > 100 or ($added + $removed) > 20000);
     }
 
     /**
diff --git a/src/IDF/Scm/Mercurial.php b/src/IDF/Scm/Mercurial.php
index d25a9d7..c059899 100644
--- a/src/IDF/Scm/Mercurial.php
+++ b/src/IDF/Scm/Mercurial.php
@@ -306,17 +306,14 @@ class IDF_Scm_Mercurial
     }
 
     /**
-     * Get commit size.
-     *
-     * Get the sum of all the added/removed lines and the number of
-     * affected files.
+     * Check if a commit is big.
      *
      * @param string Commit ('HEAD')
-     * @return array array(added, removed, affected)
+     * @return bool The commit is big
      */
-    public function getCommitSize($commit='HEAD')
+    public function isCommitLarge($commit='HEAD')
     {
-        return array(0, 0, 0);
+        return false;
     }
 
     /**
diff --git a/src/IDF/Scm/Svn.php b/src/IDF/Scm/Svn.php
index bf7663f..9abf01b 100644
--- a/src/IDF/Scm/Svn.php
+++ b/src/IDF/Scm/Svn.php
@@ -290,17 +290,25 @@ class IDF_Scm_Svn
     }
 
     /**
-     * Get commit size.
-     *
-     * Get the sum of all the added/removed lines and the number of
-     * affected files.
+     * Check if a commit is big.
      *
      * @param string Commit ('HEAD')
-     * @return array array(added, removed, affected)
+     * @return bool The commit is big
      */
-    public function getCommitSize($commit='HEAD')
+    public function isCommitLarge($commit='HEAD')
     {
-        return array(0, 0, 0);
+        if (substr($this->repo, 0, 7) != 'file://') {
+            return false;
+        }
+        // We have a locally hosted repository, we can query it with
+        // svnlook
+        $repo = substr($this->repo, 7);
+        $cmd = sprintf('svnlook changed -r %s %s',
+                       escapeshellarg($commit),
+                       escapeshellarg($repo));
+        $out = IDF_Scm::shell_exec($cmd);
+        $lines = preg_split("/\015\012|\015|\012/", $out);
+        return (count($lines) > 100);
     }
 
     private function getDiff($rev='HEAD')
diff --git a/src/IDF/Views/Source.php b/src/IDF/Views/Source.php
index bc27896..b08fa25 100644
--- a/src/IDF/Views/Source.php
+++ b/src/IDF/Views/Source.php
@@ -225,8 +225,7 @@ class IDF_Views_Source
         }
         $title = sprintf(__('%s Commit Details'), (string) $request->project);
         $page_title = sprintf(__('%s Commit Details - %s'), (string) $request->project, $commit);
-        $size = $scm->getCommitSize($commit);
-        $large = ($size[2] > 100 or ($size[0] + $size[1]) > 20000);
+        $large = $scm->isCommitLarge($commit);
         $cobject = $scm->getCommit($commit, !$large);
         $rcommit = IDF_Commit::getOrAdd($cobject, $request->project);
         $diff = new IDF_Diff($cobject->changes);