diff --git a/src/Composer/Util/Http/CurlDownloader.php b/src/Composer/Util/Http/CurlDownloader.php
index de4cd3d11..bcf0a7843 100644
--- a/src/Composer/Util/Http/CurlDownloader.php
+++ b/src/Composer/Util/Http/CurlDownloader.php
@@ -49,6 +49,7 @@ class CurlDownloader
         CURLM_OUT_OF_MEMORY => array('CURLM_OUT_OF_MEMORY', 'You are doomed.'),
         CURLM_INTERNAL_ERROR => array('CURLM_INTERNAL_ERROR', 'This can only be returned if libcurl bugs. Please report it to us!'),
     );
+    private $lastInfoUpdate = 0;
 
     private static $options = array(
         'http' => array(
@@ -240,6 +241,7 @@ class CurlDownloader
         }
 
         $this->checkCurlResult(curl_multi_add_handle($this->multiHandle, $curlHandle));
+        $this->lastInfoUpdate = 0;
         // TODO progress
 
         return (int) $curlHandle;
@@ -390,30 +392,35 @@ class CurlDownloader
             }
         }
 
-        foreach ($this->jobs as $i => $curlHandle) {
-            if (!isset($this->jobs[$i])) {
-                continue;
-            }
-            $curlHandle = $this->jobs[$i]['curlHandle'];
-            $progress = array_diff_key(curl_getinfo($curlHandle), self::$timeInfo);
+        if (microtime(true) - $this->lastInfoUpdate > 0.1) {
+            $this->lastInfoUpdate = microtime(true);
 
-            if ($this->jobs[$i]['progress'] !== $progress) {
-                $this->jobs[$i]['progress'] = $progress;
-
-                if (isset($this->jobs[$i]['options']['max_file_size'])) {
-                    // Compare max_file_size with the content-length header this value will be -1 until the header is parsed
-                    if ($this->jobs[$i]['options']['max_file_size'] < $progress['download_content_length']) {
-                        throw new MaxFileSizeExceededException('Maximum allowed download size reached. Content-length header indicates ' . $progress['download_content_length'] . ' bytes. Allowed ' .  $this->jobs[$i]['options']['max_file_size'] . ' bytes');
-                    }
-
-                    // Compare max_file_size with the download size in bytes
-                    if ($this->jobs[$i]['options']['max_file_size'] < $progress['size_download']) {
-                        throw new MaxFileSizeExceededException('Maximum allowed download size reached. Downloaded ' . $progress['size_download'] . ' of allowed ' .  $this->jobs[$i]['options']['max_file_size'] . ' bytes');
-                    }
+            foreach ($this->jobs as $i => $curlHandle) {
+                if (!isset($this->jobs[$i])) {
+                    continue;
                 }
+                $curlHandle = $this->jobs[$i]['curlHandle'];
+                $progress = array_diff_key(curl_getinfo($curlHandle), self::$timeInfo);
 
-                // TODO progress
+                if ($this->jobs[$i]['progress'] !== $progress) {
+                    $this->jobs[$i]['progress'] = $progress;
+
+                    if (isset($this->jobs[$i]['options']['max_file_size'])) {
+                        // Compare max_file_size with the content-length header this value will be -1 until the header is parsed
+                        if ($this->jobs[$i]['options']['max_file_size'] < $progress['download_content_length']) {
+                            throw new MaxFileSizeExceededException('Maximum allowed download size reached. Content-length header indicates ' . $progress['download_content_length'] . ' bytes. Allowed ' .  $this->jobs[$i]['options']['max_file_size'] . ' bytes');
+                        }
+
+                        // Compare max_file_size with the download size in bytes
+                        if ($this->jobs[$i]['options']['max_file_size'] < $progress['size_download']) {
+                            throw new MaxFileSizeExceededException('Maximum allowed download size reached. Downloaded ' . $progress['size_download'] . ' of allowed ' .  $this->jobs[$i]['options']['max_file_size'] . ' bytes');
+                        }
+                    }
+
+                    // TODO progress
+                }
             }
+
         }
     }
 
diff --git a/src/Composer/Util/HttpDownloader.php b/src/Composer/Util/HttpDownloader.php
index 8f3d606d8..045e9575b 100644
--- a/src/Composer/Util/HttpDownloader.php
+++ b/src/Composer/Util/HttpDownloader.php
@@ -340,8 +340,6 @@ class HttpDownloader
             if (!$this->countActiveJobs($index)) {
                 return;
             }
-
-            usleep(1000);
         }
     }
 
diff --git a/src/Composer/Util/Loop.php b/src/Composer/Util/Loop.php
index a75888a8c..de2b8d2e8 100644
--- a/src/Composer/Util/Loop.php
+++ b/src/Composer/Util/Loop.php
@@ -85,6 +85,7 @@ class Loop
             $progress->start($totalJobs);
         }
 
+        $lastUpdate = 0;
         while (true) {
             $activeJobs = 0;
 
@@ -95,15 +96,20 @@ class Loop
                 $activeJobs += $this->processExecutor->countActiveJobs();
             }
 
-            if ($progress) {
+            if ($progress && microtime(true) - $lastUpdate > 0.1) {
+                $lastUpdate = microtime(true);
+                echo "setting progress\n";
                 $progress->setProgress($progress->getMaxSteps() - $activeJobs);
             }
 
             if (!$activeJobs) {
                 break;
             }
+        }
 
-            usleep(5000);
+        // as we skip progress updates if they are too quick, make sure we do one last one here at 100%
+        if ($progress) {
+            $progress->setProgress($progress->getMaxSteps());
         }
 
         unset($this->currentPromises[$waitIndex]);