PHPStorm not showing Cyclomatic complexity with PHPMD

What code sample are you using?
I've tried with a default one from here, and it seems to work (Ubuntu 16.04, global PHPMD 2.5.0 installed with Composer):

<?php

// Cyclomatic Complexity = 11

function fiddle() {}
class Foo {

   public function example() {
      $a = 1;
      $b = 2;
      if ($a == $b) {
         if ($a == $b) {
            fiddle();
         } elseif ($a == $b) {
            fiddle();
         } else {
            fiddle();
         }
      } elseif ($a == $b) {
         while ($a == $b) {
            fiddle();
         }
      } elseif ($a == $b) {
         for ($n = 0; $n < $b; $n++) {
            fiddle();
         }
      } else {
         switch ($a) {
            case 1:
               fiddle();
               break;
            case 2:
               fiddle();
               break;
            case 3:
               fiddle();
               break;
            default:
               fiddle();
               break;
         }
      }
   }
}

I tried it with your example, while I was fidgeting around with it my cyclomatic complexity showed up. It took a really long time though. So I guess the problem is that whenever I open a file it takes a long to for the CCN to show up. Could anything be done about that? 

You can run Code > Inspect Code & select an Inspection profile you've configured. How long would it take to pass?