woocommerce products slow loading

Hi all,
loading pages on my site http://www.infinitytrophy.ro what contains woocommerce products is very slow, takes around 20 sec, same in administration part. I have already tried couple of plugins for optimizing database(I think there is problem because the products was imported from virtuemart trough cart2cart service), like WP Optimize, Query monitor(I don`t see there anything special). Can somebody help me how to find the cause of slow loading?

Thanks in advice!