diff --git a/README.md b/README.md
index 71fddae..85a1fbc 100644
--- a/README.md
+++ b/README.md
@@ -23,12 +23,11 @@ These formats are supported for now: `http`, `curl`, `wget`.
 ## Planned features
 
 - support as many as possible/necessary of authentication kinds (_currently no ones_);
-- support as many as possible/necessary of body formats (_currently json and formdata_);
+- support as many as possible/necessary of body formats (_currently only `json` and `formdata`_);
 - documentation generation support (markdown) with responce examples (if present);
 - maybe some another convert formats (like httpie or something...);
 - replace `{{vars}}` from folder;
 - replace `{{vars}}` from environment;
-- performance measurement;
 - better logging;
 - tests, phpcs, psalm, etc.;
 - web version.
diff --git a/pm-convert b/pm-convert
index 9cf0a06..1168f11 100755
--- a/pm-convert
+++ b/pm-convert
@@ -21,7 +21,7 @@ foreach ($paths as $path) {
 is_null($file) && throw new RuntimeException('Unable to locate autoload.php file.');
 
 try {
-    (new Processor($argv))->start();
+    (new Processor($argv))->convert();
 } catch (Exception $e) {
     fwrite(STDERR, sprintf('ERROR: %s%s', $e->getMessage(), PHP_EOL));
     die(1);
diff --git a/src/Processor.php b/src/Processor.php
index 7450d29..df7d5b8 100644
--- a/src/Processor.php
+++ b/src/Processor.php
@@ -54,6 +54,16 @@ class Processor
      */
     protected array $collections = [];
 
+    /**
+     * @var int Initial timestamp
+     */
+    protected int $init_time;
+
+    /**
+     * @var int Initial RAM usage
+     */
+    protected int $init_ram;
+
     /**
      * Constructor
      *
@@ -61,6 +71,8 @@ class Processor
      */
     public function __construct(protected array $argv)
     {
+        $this->init_time = hrtime(true);
+        $this->init_ram = memory_get_usage(true);
     }
 
     /**
@@ -181,22 +193,43 @@ class Processor
      *
      * @throws Exception
      */
-    public function start(): void
+    public function convert(): void
     {
         $this->parseArgs();
         $this->initOutputDirectory();
         $this->initConverters();
         $this->initCollections();
+        $count = count($this->collections);
+        $current = 1;
+        $success = 0;
         print(implode(PHP_EOL, array_merge($this->version(), $this->copyright())) . PHP_EOL . PHP_EOL);
         foreach ($this->collections as $collectionName => $collection) {
-            print("Converting '$collectionName':" . PHP_EOL);
+            printf("Converting '%s' (%d/%d):%s", $collectionName, $current, $count, PHP_EOL);
             foreach ($this->converters as $type => $exporter) {
-                print("\t-> " . strtolower($type));
+                printf(' > %s', strtolower($type));
                 $outputPath = sprintf('%s%s%s', $this->outputPath, DIRECTORY_SEPARATOR, $collectionName);
                 $exporter->convert($collection, $outputPath);
-                printf("\t- OK: %s%s", $exporter->getOutputPath(), PHP_EOL);
+                printf(' - OK: %s%s', $exporter->getOutputPath(), PHP_EOL);
             }
+            print(PHP_EOL);
+            ++$current;
+            ++$success;
         }
+        $this->printStats($success, $current);
+    }
+
+    /**
+     * Outputs some statistics
+     *
+     * @param int $success
+     * @param int $count
+     * @return void
+     */
+    protected function printStats(int $success, int $count): void
+    {
+        $time = (hrtime(true) - $this->init_time) / 1_000_000;
+        $ram = (memory_get_peak_usage(true) - $this->init_ram) / 1024 / 1024;
+        printf('Converted %d of %d in %.3f ms using %.3f MiB RAM', $success, $count, $time, $ram);
     }
 
     /**