Is the plugin lightweight?

Absolutely. The free version uses core WordPress functions and built-in PHP constants to detect version data. It has near-zero impact on page load speed and memory usage, with no external API calls, no custom database tables, and no frontend output.

The PRO version is equally performance-conscious. It utilizes the WordPress Heartbeat API and Transients API to ensure system checks (CPU, RAM, database size) are cached and never recalculated on every page load. CPU and memory data is cached for 60 seconds, and database size is cached for 12 hours.