Doctrine 2 why is the first query taking longer?

Question

Doctrine ORM

I do:

for ($i = 0; $i < 5; $i++) {
  $time = microtime(true);
  $em->getRepository('Test\Entity')->findAll();
  echo microtime(true) - $time;
}

Query execution time
0.049312114715576
0.0063920021057129
0.0064208507537842
0.005681037902832
0.0060789585113525
Why is the first fetch so long? In this case, the entities can be different, but the first one always works out much longer.
I install the cache - memcache

$config->setMetadataCacheImpl($cache);
$config->setQueryCacheImpl($cache);
$config->setResultCacheImpl($cache);
$config->setHydrationCacheImpl($cache);

Answer 1

They didn’t exactly find the problem, but most likely the problem is in the server (virtualka) T, k. no problems were found on the local machine and production(