how to simulate a real user to test website / shop?

Does anyone know a web service or tool which you can simulate with an automated bot a real User and this User test your website/shop and click every product and link and tell you if something is wrong or bad?

I just know of custom solutions. But thats a little bit of work.

I would do that with node.js and puppeteer. Its possible to scan the console for errors and also make screenshots.

But there may be better ways ofcourse...

i have the problem in my company the onlineshop is very slow for the EU customers. I told our developers and server admins they should use also a CDN, DNS AnyCast etc. but they tell me all the time only the answer the server is fast enough. We need more traffic that the pictures are in the cach of Varnish. But currently if users are going on the website they jump back because the website is slow and varnish cannot cache it. So my idea is to run a bot like a user witch click in the night on the products that they are in the varnish cache and in the rest of the day for the new users the shop is very fast…

i solved the problem now with https://screenster.io/

Selenium is the best tool for your issue. If you know how to write program.