diff --git a/core/modules/image/src/Entity/ImageStyle.php b/core/modules/image/src/Entity/ImageStyle.php
index 96e442f..c9e50ed 100644
--- a/core/modules/image/src/Entity/ImageStyle.php
+++ b/core/modules/image/src/Entity/ImageStyle.php
@@ -80,6 +80,20 @@ class ImageStyle extends ConfigEntityBase implements ImageStyleInterface, Entity
   protected $label;
 
   /**
+   * Indicates whether runtime variables should be reset.
+   *
+   * When TRUE, the runtime variables will be reset at next call of
+   * ::createDerivative, ::transformDimensions, ::getDerivativeExtension.
+   *
+   * @see ::createDerivative
+   * @see ::transformDimensions
+   * @see ::getDerivativeExtension
+   *
+   * @var bool
+   */
+  protected $resetRuntimeEnvironment = TRUE;
+
+  /**
    * The array of image effects for this image style.
    *
    * @var array
@@ -292,10 +306,13 @@ public function createDerivative($original_uri, $derivative_uri) {
       return FALSE;
     }
 
-    $this->getEffects()->resetRuntimeVariables();
+    if ($this->resetRuntimeEnvironment) {
+      $this->getEffects()->resetRuntimeVariables();
+    }
     foreach ($this->getEffects() as $effect) {
       $effect->applyEffect($image);
     }
+    $this->resetRuntimeEnvironment = TRUE;
 
     if (!$image->save($derivative_uri)) {
       if (file_exists($derivative_uri)) {
@@ -311,26 +328,40 @@ public function createDerivative($original_uri, $derivative_uri) {
    * {@inheritdoc}
    */
   public function transformDimensions(array &$dimensions, $uri) {
-    $this->getEffects()->resetRuntimeVariables();
+    if ($this->resetRuntimeEnvironment) {
+      $this->getEffects()->resetRuntimeVariables();
+    }
     foreach ($this->getEffects() as $effect) {
       $effect->transformDimensions($dimensions, $uri);
     }
+    $this->resetRuntimeEnvironment = TRUE;
   }
 
   /**
    * {@inheritdoc}
    */
   public function getDerivativeExtension($extension) {
-    $this->getEffects()->resetRuntimeVariables();
+    if ($this->resetRuntimeEnvironment) {
+      $this->getEffects()->resetRuntimeVariables();
+    }
     foreach ($this->getEffects() as $effect) {
       $extension = $effect->getDerivativeExtension($extension);
     }
+    $this->resetRuntimeEnvironment = TRUE;
     return $extension;
   }
 
   /**
    * {@inheritdoc}
    */
+  public function skipRuntimeEnvironmentReset($skip = TRUE) {
+    $this->resetRuntimeEnvironment = !$skip;
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function getPathToken($uri) {
     // Return the first 8 characters.
     return substr(Crypt::hmacBase64($this->id() . ':' . $this->addExtension($uri), $this->getPrivateKey() . $this->getHashSalt()), 0, 8);
diff --git a/core/modules/image/src/ImageStyleInterface.php b/core/modules/image/src/ImageStyleInterface.php
index 9507291..43d3ae5 100644
--- a/core/modules/image/src/ImageStyleInterface.php
+++ b/core/modules/image/src/ImageStyleInterface.php
@@ -153,6 +153,29 @@ public function transformDimensions(array &$dimensions, $uri);
   public function getDerivativeExtension($extension);
 
   /**
+   * Indicates to skip resetting runtime variables.
+   *
+   * Allows to skip resetting runtime variables at next call of any of
+   * ::createDerivative, ::transformDimensions, ::getDerivativeExtension
+   * methods. The setting is only relevant for next call, further calls of
+   * these methods will be resetting the variables, unless this method is
+   * called again.
+   *
+   * @param bool $skip
+   *   (optional) When TRUE, the runtime variables will not be reset at next
+   *   call of ::createDerivative, ::transformDimensions,
+   *   ::getDerivativeExtension. When FALSE, runtime variables will be reset.
+   *   Defaults to TRUE.
+   *
+   * @return $this
+   *
+   * @see ::createDerivative
+   * @see ::transformDimensions
+   * @see ::getDerivativeExtension
+   */
+  public function skipRuntimeEnvironmentReset($skip = TRUE);
+
+  /**
    * Returns a specific image effect.
    *
    * @param string $effect
diff --git a/core/modules/image/src/Tests/ImageAdminStylesTest.php b/core/modules/image/src/Tests/ImageAdminStylesTest.php
index f2abd78..62e9aa5 100644
--- a/core/modules/image/src/Tests/ImageAdminStylesTest.php
+++ b/core/modules/image/src/Tests/ImageAdminStylesTest.php
@@ -503,6 +503,16 @@ public function testImageStyleRuntimeVariables() {
     $this->assertEqual(20, $dimensions['width']);
     $this->assertEqual($style->id(), $style->getEffects()->getRuntimeVariables()->get('image_style_id'));
     $this->assertEqual(200, $style->getEffects()->getRuntimeVariables()->get('test_variable'));
+
+    // Set skipping runtime environment reset and re-run transform dimensions.
+    // 'test_variable' should be at 400.
+    $style->skipRuntimeEnvironmentReset()->transformDimensions($dimensions, NULL);
+    $this->assertEqual(400, $style->getEffects()->getRuntimeVariables()->get('test_variable'));
+
+    // Run transform dimensions again, the runtime variables should have been
+    // reset. 'test_variable' should be at 200.
+    $style->transformDimensions($dimensions, NULL);
+    $this->assertEqual(200, $style->getEffects()->getRuntimeVariables()->get('test_variable'));
   }
 
 }