Diagnostic Tools
Tools for evaluating performance issues.
This page includes information on diagnostics and tools for evaluating performance issues.
Lighthouse
Google's Lighthouse provides automated audits for performance, accessibility, progressive web apps, and SEO. Lighthouse audit reports can have a big impact on your frontend performance.
You can configure the audit reports to produce consistent measurements of how your site is experienced by users. The audit reports also highlight areas on your site that can be improved to provide a better user experience.
New Relic
New Relic® Performance Monitoring offers a wide array of metrics that provide a nearly real-time look into web application performance.
Monitor Performance with New Relic
If your site doesn't seem to be able to send uncached content fast enough, enable monitoring services for free with New Relic to help identify bottlenecks.
Helper Tools
There are toolbars for both Drupal and WordPress that provide stats like the number of queries, amount of memory, and response time. These can be helpful for real time debugging.
For debugging deep and complex server-side performance problems you might need to run your site locally with profiler like Blackfire.