Shopify - Fix some issues - URGENT - Pls only contact me if you can do this

Job ID: 35365077

Budget: $30 – $250 AUD

There are some issue on our shopify site-

1. Card messages that customer types in at checkout are not always showing in the backend?
2. Date for delivery that customer selects on pop up calendar is not always showing in backend?
3. The "add to your product" items and categories are missing all of a sudden - not sure why?
4. Speed of our website is very slow - needs to be faster

We need all the above fixed as soon as possible.
The theme we have on Shopify is: Porto3.6.1
Related categories: PHP CSS HTML Shopify Templates Shopify