WordPress/WooCommerce Expert Needed ASAP - Slow Checkout

Hi! I'm looking for someone who really knows WooCommerce performance and can help me as soon as possible. My digital wedding planning product is already live, but my checkout is taking around 6–8 seconds to load and I can't work out why. I've already spent way too many hours trying to fix it myself. Here's what I've already discovered: The website is hosted with Xneelo. I'm using the Total Theme with WPBakery. If I switch to a default WordPress theme, the checkout loads in 1–2 seconds. With my current theme, it jumps back to 6–8 seconds. I've upgraded my hosting, removed unnecessary plugins and simplified the checkout page, but it's still slow. I'm looking for someone who can quickly identify what's causing the delay and fix it properly—not just install another caching plugin. I'd also like to make sure everything still works afterwards: Stripe payments Order confirmation emails Digital product delivery after purchase If you've fixed WooCommerce performance issues like this before, I'd love to hear from you. Please tell me: What you think the issue is likely to be. How you'd diagnose it. How quickly you could start. My website is www.lovelienkie.com and the digital product I’m referring to is: https://www.lovelienkie.com/simplified-wedding-planning-toolkit-by-lienkie-a-real-wedding-planner/ if you'd like to have a quick look before applying. Please start your proposal with "Checkout Expert" so I know you've read the job description.