Ursa Major Solar customer records have a lot of fields and Lightning components to give users a variety of information and available functions…

The Lightning App Builder includes a built-in performance analysis tool. By clicking the "Analyze" button in the toolbar while editing a Lightning record page, an administrator can get a performance assessment. This tool provides a predicted page load time for both desktop and mobile, identifies components that have the most impact on load time, and offers specific, actionable recommendations to improve the page's performance. This is the most direct and appropriate tool for diagnosing the issue described.

A. Debug logs in Setup are primarily for troubleshooting backend processes like Apex, flows, and validation rules, not for analyzing frontend Lightning component performance.
C. The Developer Console's debug logs serve the same purpose as those in Setup and are not designed to analyze Lightning page load times.
D. The Apex debugger is a tool for interactively debugging Apex code execution, which is unrelated to the rendering performance of Lightning components on a page.

1. Salesforce Help. (2023). Analyze Your Lightning Page's Performance. Salesforce, Inc. Retrieved from https://help.salesforce.com/s/articleView?id=sf.lightningappbuilderanalyze.htm&type=5. (This document explicitly states, "In the Lightning App Builder, the Analyze button in the toolbar gives you a predicted page load time and recommendations to improve it.")

2. Trailhead by Salesforce. (2023). Lightning App Builder Module, Optimize Lightning Experience Performance Unit. Salesforce, Inc. Retrieved from https://trailhead.salesforce.com/content/learn/modules/lightning-app-builder/optimize-lightning-experience-performance. (This unit details the use of the Analyze button for performance optimization.)