Here a strange thing,
On Chrome the site takes a lot of time to load, while in Safari it is very fast.
Recently we have been added a lot of Items in the site. Around 6000 Items in total. And some other transactions. But Items is the one that we have been working the most.
On digitalOcean I see the monitoring and it does not show server overload or anything.
This is the console of Chrome:
And Safari console: