<aside> 🎆 “If a picture is worth a thousand words, a replay is worth a thousand pictures” - Zack Rosen, Pantheon CEO

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Summary

Challenges:

• Growing Engineering team from 60 to 200 with a limited understanding of how to scale platform and address performance issues
• 10-12 second initial load time on new dashboard with no clear path to address issues
• Determining tech stack tradeoffs whilst adding new code on top of an old codebase

Approach/Solutions:

• Adopting Replay to reproduce difficult bugs and performance issues
• Using Replay to see what was happening in the code when performance drags occurred
• CEO and FE Leadership re-prioritized mid-sprint and set clear direction for its dashboard

Why Replay?

• The only developer tool that actually gave a deep understanding of perf bottlenecks
• Enabling CEO and Engineering Leadership to make its Dashboard a more performant site
• Accelerate onboarding of new engineers

Results

• Within 6 months, improved platform load time 500% (10-12 second to 2 second average)
• Higher confidence from C-Suite in understanding performance issues and setting priorities
• Mean time to resolution on bug fixes reduced significantly (weeks → days)
• Engineers can start contributing to bug fixes within days on the job