The number of uploaded items on the web portal page

Hello everyone,

We use Version 9.2 and the old version of the portal (not Angular)

A web page (category) that contains over 15 000 service items takes a very long time to load (over 50 sec)

I think that the entire list of 15,000 items is loaded at once, because if I go to the next page the download runs again over 50 sec (however only 25 items are displayed on the web page)

How can I set a limit on the number of uploaded service items on a page ? Or maybe there is another solution?

Thanks