Carro will never slow down your site, but it's a common issue for Shopify merchants.
Our partners at Storetasker are very frequently hired to refactor code and optimize a website’s asset and app architecture to gain extra speed. There is a science to this art, and it involves a certain level of investigative work, trying to find the key culprits of slowing your site down.
Whether that’s apps, poor code, images, fonts, or even the overall theme - their developers will be able to fix what needs to be done to speed up your site. You can learn more HERE.