Web Scraping using simplehtmldom on multiple sites - codeigniter

Question

I am using simplehtmldom parser for my recent web scraping project and the project is actually building a price comparing website build with CodeIgniter. The website has to fetch product names, description and price from different shopping websites. Here is my code:
$this->dom->load_file('http://www.site1.com');
$price1 = $this->dom->find("span[itemprop=price]");
$this->dom->load_file('http://www.site2.com');
$price2 = $this->dom->find("div.price");
$this->dom->load_file('http://www.site3.com');
$price3 = $this->dom->find("div.priceBold");
$this->dom->load_file('http://www.site4.com');
$price4 = $this->dom->find("span.fntBlack");
$this->dom->load_file('http://www.site5.com');
$price5 = $this->dom->find("div.price");
The above code takes approximately 15-20 seconds to load the result into the screen. When I try with only one site, it just takes 2 seconds. This is how the simplehtmldom works with multiple domains? Or is there a way to optimize it?

Answer 1

PHP Simple HTML DOM Parser has some memory leak issue, so before trying to load a new page, clear the previous one using:
$this->dom->clear();
unset($this->dom);
If this doesn't change anything, then one of your websites is taking much time to respond... you'll have to check one by one to find the culprit xD