Checkout Speed is really slow and have weird URLs PLEASE HELP

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We just launched our store on Shopify and basically everything is fine.. But when on the checkout the site is getting really slow (like 5 seconds per click). The cart page is okay, but after click "checkout" it starts loading really slow and you see the url is getting really long! It looks like you getting redirected. For a customer it looks like it's unsafe! I know this type of URLs when an app will track a conversion (for Example Klaviyo Mails also have long URLs). But in this case I should not have any apps being in my checkout process.. I disabled all apps which could have something to do with it (don't even have an upsell app installed). PLEASE HELP

here is the site: