how to delete an app from shopify store permanently.

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How to delete an app from the Shopify store permanently. This has been dragging on for months now, and I had to pay to get my SEO fixed. Now the speed has gone from 85 to 66. I have tons of uninstalled apps in my store, which I think is affecting my store speed and checkout. I have been talking to countless representatives from Shopify and have gotten no answers on how to get rid of this problem. Is there anyone who can assist me?