* UPDATE: Updated PHP and WordPress recommendations
* UPDATE: Used the IntersectionObserver API to only prerender links when they are visible. This will prevent the browser from prerendering links that the user may never actually interact with, which can improve the overall performance of the page. Additionally, using requestIdleCallback to schedule the prerendering logic to run when the browser is idle can ensure that the user's experience is not impacted by the prerendering process.
* UPDATE: Used the performance.now() function to measure the time it takes to execute the prefetching logic. The prefetch_throttle_delay value is adjusted based on the measured performance, ensuring that the prefetching logic only runs when the browser is able to handle it without impacting the user's experience.
* UPDATE: Optimized back-end performance by refactoring several loops
* UPDATE: Refactored code to allow for faster execution
