Why pages in my e-shop load too slow?

Please help me, I learn to make this site all alone, reading in internet. I used Ocean WP theme and really like it, but… Now I couldn;t find why pages load so slow. I have around 10 products and it;s loading slow, but my idea is to add more than 1000 and may be it will be really, really slow loading. What should I do?

The page I need help with: [log in to see the link]