Very slow WP website

Hi
I’m sort of new at working with WP.
Have recently built this website: http://mana-organics.com/
Its extremely slow to load and often, i have to refresh the page a number of times before I can even access the wp admin.

Things I’ve tried with no success:
1. Remove all plugins: site did not load any faster.
2. Use WP Optimize: no help here either.
3. Use WP Super Cache: again no improvement in site load times.
4. Reduce image size: once again no change.

I do not know Php and nor am I sure how to check this, but I feel as though the server stops responding from time to time.
Any help will be appreciated and thank you for patience.
Arjun