Thanks for your suggestions William, i appreciate.

The weird thing is that in the version 1.0 the process was even heavier than in the latest release. And also your site has not so much visits, also compared to server resources.

I don't think that the database foundation of the component could be more lightweight, it uses a single and simple table
called #__jrealtime_serverstats that you can see using for example phpMyAdmin.

By the way about the PDF report generation, the main problem is that it uses a famous third party library TCPDF, so we have no direct control of this code and as a result of our tests the translations of data to PDF requires resources.

A good alternative could be add a different format, i mean exporting data in Excel documents. We have planned to run tests for this and add in next version, hopefully this process can be less resource intensive.