Observed Signal · Jul 23, 2026 · Technical Release · Source: DEV Community · Impact: 2/5 · Sentiment: Positive
Dashboard optimized: 7.6s → 1.7s for 15 numbers
A developer post documents diagnosing and fixing a slow Next.js/MongoDB dashboard where rendering fifteen numbers took 7.6 seconds. Using Sentry (with explicit mongo/mongoose integrations) and a seeded high-volume dataset, the author found three issues: unprojected Invoice.find() returning 2,004 full documents (including base64 logos), client-side reductions scanning 4,806 tasks instead of server-side aggregation, and a non-deterministic sort comparator. Changes (add .select exclusions, use MongoDB aggregation with $facet, and fix comparator) reduced total server time from 7,580 ms to 1,671 ms, cut bytes read from ~24.8 MB to ~6.0 MB, and reduced overview bytes from 2,490 KB to 2.0 KB.
Practical APM and MongoDB query/aggregation fixes improve web app performance and observability; useful operational guidance but not industry-shifting.
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Key Takeaways & Evidence Grounding
- DevLabs platform uses Next.js 16, React 19, and MongoDB/Mongoose.
- Sentry's default integrations do not include Mongo/Mongoose; the author enabled node.mongoIntegration() and node.mongooseIntegration() to see DB spans.
- Three bugs were fixed: unprojected Invoice.find() returning full documents (including base64 logos), client-side reduction of project activity instead of server-side aggregation, and a comparator that violated Array.sort() contract.
- Performance before → after: total server time 7,580 ms → 1,671 ms; getInvoicesAdmin() 6,669 ms → 1,597 ms; getDashboardOverview() 911 ms → 74 ms.
- Data transferred before → after: Mongo read ~24,849 KB → 6,048 KB; overview bytes returned 2,490 KB → 2.0 KB.
Connected Companies & Entities
“I wired up @sentry/nextjs expecting the trace to point at the slow query. Instead the whole request came back as one opaque server span.”
“DevLabs is the agency platform my team runs the business on. Next.js 16, React 19, MongoDB/Mongoose, ~34k lines.”
Ontology Mapping & Concepts
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