Troubleshoot the reasons for the page rendering issues
Users report that pages are taking a long time to render. You need to troubleshoot the reasons for the page rendering issues. You monitor the SharePoint BLOB cache, the ASP.NET output cache, and the SharePoint object cache. Does it meet the goal?
The answer of course is “YES”.
According to MS official article here, these 3 types of cache directly related to web pages load in the browser.
I never try to monitor those caches myself. Surely it will be a very time consuming process. But they surely one of the option you should take into consider.