diff --git a/CHANGELOG-3.4.md b/CHANGELOG-3.4.md
index 39bdf7acc9a6f..033dc4d684c6a 100644
--- a/CHANGELOG-3.4.md
+++ b/CHANGELOG-3.4.md
@@ -7,6 +7,10 @@ in 3.4 minor versions.
 To get the diff for a specific change, go to https://github.com/symfony/symfony/commit/XXX where XXX is the change hash
 To get the diff between two versions, go to https://github.com/symfony/symfony/compare/v3.4.0...v3.4.1
 
+* 3.4.x (2018-xx-xx)
+
+ * bug #25999 [DependencyInjection] Huge performance degradation of ReflectionClassResource and FileResource on big projects inside Docker For Mac
+
 * 3.4.4 (2018-01-29)
 
  * bug #25932 Don't stop PSR-4 service discovery if a parent class is missing (derrabus)
diff --git a/src/Symfony/Component/Config/Resource/FileResource.php b/src/Symfony/Component/Config/Resource/FileResource.php
index 5d71d87918c8f..cb6ad2e072694 100644
--- a/src/Symfony/Component/Config/Resource/FileResource.php
+++ b/src/Symfony/Component/Config/Resource/FileResource.php
@@ -60,7 +60,9 @@ public function getResource()
      */
     public function isFresh($timestamp)
     {
-        return file_exists($this->resource) && @filemtime($this->resource) <= $timestamp;
+        $filemtime = @filemtime($this->resource);
+
+        return $filemtime && $filemtime <= $timestamp;
     }
 
     public function serialize()
diff --git a/src/Symfony/Component/Config/Resource/ReflectionClassResource.php b/src/Symfony/Component/Config/Resource/ReflectionClassResource.php
index a8e1f9611b99a..1371d7d6fe322 100644
--- a/src/Symfony/Component/Config/Resource/ReflectionClassResource.php
+++ b/src/Symfony/Component/Config/Resource/ReflectionClassResource.php
@@ -37,11 +37,12 @@ public function isFresh($timestamp)
         }
 
         foreach ($this->files as $file => $v) {
-            if (!file_exists($file)) {
+            $filemtime = @filemtime($file);
+            if (!$filemtime) {
                 return false;
             }
 
-            if (@filemtime($file) > $timestamp) {
+            if ($filemtime > $timestamp) {
                 return $this->hash === $this->computeHash();
             }
         }
diff --git a/src/Symfony/Component/DependencyInjection/Config/AutowireServiceResource.php b/src/Symfony/Component/DependencyInjection/Config/AutowireServiceResource.php
index 0eac93964b94c..2cd1cd1ece204 100644
--- a/src/Symfony/Component/DependencyInjection/Config/AutowireServiceResource.php
+++ b/src/Symfony/Component/DependencyInjection/Config/AutowireServiceResource.php
@@ -34,12 +34,13 @@ public function __construct($class, $path, array $autowiringMetadata)
 
     public function isFresh($timestamp)
     {
-        if (!file_exists($this->filePath)) {
+        $filemtime = @filemtime($this->filePath);
+        if (!$filemtime) {
             return false;
         }
 
         // has the file *not* been modified? Definitely fresh
-        if (@filemtime($this->filePath) <= $timestamp) {
+        if ($filemtime <= $timestamp) {
             return true;
         }