If it's WooCommerce on WordPress, your problem is (I'm almost positive) plugins. In every WordPress site I ever worked on, the more plugins that were active, the slower it ran.

However, speed comes in a few forms: are you talking about strictly page loading speed? Or is there a certain part that drags (such as checkout)? Or something else (like the admin section)?

I'm probably more expensive than you need for something like this, but look into Copter Labs (copterlabs.com) for help. That's the agency I started and sold with 300+ WordPress builds (many using WooCommerce) under their belt, all on custom themes, so there's a deep understanding of HOW WordPress works instead of throwing plugins at it to make it do things.

Or, if you'd prefer, we can set up a short call and I can review the site and give you some insight into what's going on. Once we identify the problem, you could contract someone else to fix it.

Drop me a line if you want to move forward.

Good luck!