Over a six-week period, significant improvements were made to the performance of Graphite's application server, nicknamed "subwoofer," by addressing key issues that caused intermittent latency spikes and server inefficiencies. The investigation revealed that Graphite's P95 latency metrics were sometimes misleading due to outliers and integration with third-party APIs like GitHub, leading to unnecessary scaling and troubleshooting. By delving deeper into endpoint-specific latency spikes and event loop blockers, the team discovered that excessive synchronous computation and large database queries were major culprits, prompting a shift to worker threads and more efficient query handling. Additionally, the realization that not all background processes impact top-line performance led to strategic optimizations, such as unshipping non-essential features. These efforts resulted in smoother, more consistent performance metrics, allowing for better detection of regressions and a clearer understanding of overall site performance trends. The ongoing work focuses on reducing endpoint latencies and sustaining the improvements achieved, providing a more reliable user experience.