Developer discovers dashboard took 7.6 seconds to load due to three separate bugs

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A developer at agency platform DevLabs found their client-facing dashboard was taking 7.6 seconds to render just fifteen data points — four stat tiles, three donut chart slices, six bars, and four invoices. The performance issue had gone undetected for months because the local development database contained only four invoices, where load time was a near-instant 111 milliseconds. Using Sentry's performance monitoring tools, the developer identified that MongoDB and Mongoose database spans are not included in Sentry's default integrations and must be manually configured, which had been masking the true source of slowness. Once instrumentation was correctly set up, a single oversized database query span was immediately visible as the primary bottleneck, alongside two additional separate issues. To measure fixes accurately, the developer built a tagged data-volume generator and benchmark harness against a realistic dataset, ensuring results were reproducible without risking real client records.

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