Slow loading of website at the start

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The website that I'm working on takes really slow to load at the start. Upon checking, there are 2 errors:

1) javascript:1 Failed to load resource: the server responded with a status of 404 (Not Found)

2) Uncaught SyntaxError: Unexpected token < in JSON at position 0
at JSON.parse (<anonymous>)
at XMLHttpRequest.c.onreadystatechange (16a6350df11003fed28421240455d667.js?

I realised for number 1, it's due to an old app that I've deleted. I saw the script but I'm not sure how to remove it from shopify backend. 

Not sure what number 2 is. You can take a look at the website: