Problem HTML request Wordpress/Woocommerce

Hi,

My website is very slow, sometimes I have to wait up to 30 secondes for a page to open ([URL visible pour les membres Pro]).
I run some tests and ended with a request problem with the HTML. If you inspect the website with Google Network you will see there is an image "job6.jpg" in red that point the problem.
I delete all the job6 images but apparently there is still a request made for them that slow down the process.
I'm not an expert so I'm maybe mistaken ^^