Why did Instagram Explore page load time increase to 5 seconds?

Introduction

The sudden increase in Instagram Explore page load time to 5 seconds is a critical issue that demands immediate attention. This performance degradation directly impacts user experience, engagement, and potentially, user retention. 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 this might be a recent change. When exactly did we start noticing this increase in load time?

Why it matters: Helps pinpoint potential causes related to recent changes or events. Expected answer: Within the last week or two. Impact on approach: Recent timing might suggest a correlation with recent deployments or changes.

• Considering user segments, I'm wondering if this is affecting all users equally. Are we seeing this 5-second load time across all devices and regions?

Why it matters: Identifies whether the issue is global or localized to specific user segments. Expected answer: The issue is more pronounced on Android devices and in certain geographic regions. Impact on approach: Would focus on device-specific or region-specific factors in our analysis.

• Given the nature of the Explore page, I'm curious about content volume. Has there been a significant increase in the amount of content being processed for the Explore page recently?

Why it matters: Could indicate if the issue is related to data processing or content recommendation algorithms. Expected answer: Yes, there's been a 20% increase in content volume over the past month. Impact on approach: Would investigate scalability issues in content processing and recommendation systems.

• Thinking about system changes, have we recently updated our CDN configuration or made any changes to our content delivery infrastructure?

Why it matters: Infrastructure changes could directly impact load times. Expected answer: A new CDN provider was onboarded last week. Impact on approach: Would focus on CDN configuration and performance optimization.

• Considering measurement accuracy, has there been any change in how we're measuring or defining load time for the Explore page?

Why it matters: Ensures we're dealing with a real issue and not a measurement anomaly. Expected answer: No changes in measurement methodology. Impact on approach: Confirms the issue is real and not a result of changed metrics.