[TYPO3-mvc] findOneBy memory usage

[Saverio Vigni]

Hello everyone i have a problem with the findOneBy

I'm making a simple web spider for checking the link structure of a 
quite big vacation rental website, everything goes fine until I check in 
the link table if the link I found in the page already exists, actually 
I'm using the code:

$newPage = $this->pageRepository->findOneByUrl($link->getUrl());
if(!$newPage){
     $newPage = 
$this->objectManager->create('Tx_Webspider_Domain_Model_Page');
     $newPage->setUrl($link->getUrl());
     $this->pageRepository->add($newPage);
}

this is inside the loop of the links found in the page I'm processing, 
the cal to the findOneBy makes the memory usage grow from 48MB to 
hundreds of megabytes.

I tried rewriting the function and the problem happens when I try to 
access the result of the query with the getFirst() method.
I haven't been able to understand if the leak is in my code or in 
extbase, can anybody help me?

Thank you
Saverio Vigni
http://www.hor-net.com