A good place to start is run your site through the Shopify Analyzer and see what can be optimized. Then you can either utilize free guides on our website, or contact us to handle it for you.
We also do customizations, build apps, and can handle just about anything you need for a Shopify store. If you need anything just give a shout. 👍
Thank you so much for your recommendations. Already waiting for results from Shopify Analyzer. Also, what I have noticed is, that some of the apps/features once work another time they don't work/ sometimes even disappearing. Due to many customization which we had to do, maybe codes are upside down and this can be causing the issue + slow loading time of the pages. What do you think?
Do you have any experience with something like that?
My guess is that you have some syntax errors in your code or missing files or old app code.
You can investigate by reading your console in browser developer tools. Here's a guide to find and fix errors like that: https://speedboostr.com/finding-and-fixing-server-errors.
We have a Tune Up service that addresses things like this, if you want one of our experts to take a look and try to fix them.
We will be happy to help you. Please contact here: https://www.task4store.com/pages/contact-us