Why has the average time to complete a transaction on SnapScan's mobile app increased from 10 seconds to 25 seconds this month?

Introduction

The sudden increase in transaction completion time on SnapScan's mobile app from 10 to 25 seconds is a critical issue that demands immediate attention. This significant slowdown could severely impact user experience, potentially leading to decreased engagement and lost revenue. I'll approach this problem systematically, focusing on identifying the root cause, validating hypotheses, and developing both short-term fixes and long-term solutions.

Step 1

Clarifying Questions (3 minutes)

• Looking at the timing, I'm thinking there might have been a recent app update. Has there been any significant changes or updates to the app in the past month?

Why it matters: Recent changes could directly correlate with the performance issue. Expected answer: Yes, there was an update two weeks ago. Impact on approach: If confirmed, I'd focus on changes introduced in that update.

• Considering user segments, I'm wondering if this slowdown is universal. Are all user segments experiencing this increased transaction time, or is it specific to certain groups?

Why it matters: Helps narrow down if it's a global issue or specific to certain users or devices. Expected answer: The slowdown appears to be affecting all users. Impact on approach: If universal, I'd look at system-wide changes or infrastructure issues.

• Given the specific increase from 10 to 25 seconds, I'm curious about the distribution. Is this a consistent 25-second average across all transactions, or are we seeing a mix of normal and extremely slow transactions?

Why it matters: Helps determine if it's a systemic issue or if outliers are skewing the average. Expected answer: There's a mix, with some transactions still at 10 seconds but many taking 30-40 seconds. Impact on approach: If it's a mix, I'd investigate what's different about the slower transactions.

• Thinking about potential backend changes, have there been any modifications to the payment processing systems or integrations in the last month?

Why it matters: Backend changes could significantly impact transaction times. Expected answer: No major changes to payment systems, but a new fraud detection layer was added. Impact on approach: If confirmed, I'd focus on the impact of new security measures on performance.