I ran your homepage through our Shopify Analyzer (a free analysis tool we built for the Shopify community) and it's scoring great! You can check out your report here: https://analyze.speedboostr.com/result/fy4g5eoig3
Beyond the actual scores, I've navigated around your site and it also loads and performs extremely well. You may see a slight drop in speed or performance by moving to Shopify since you're going to have some of Shopify's code running in the background. Plus, if you have any apps installed, those will also affect performance.
Overall though, your site seems to be performing quite well.