Why did Google Calendar event sync time increase to 15 minutes across devices?

Introduction

The sudden increase in Google Calendar event sync time to 15 minutes across devices is a critical issue that demands immediate attention. This problem directly impacts user experience and the core functionality of the product. I'll approach this analysis 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 observing this 15-minute sync delay?

Why it matters: Helps pinpoint potential triggers or changes that coincided with the issue. Expected answer: Within the last week or two. Impact on approach: Recent timing might suggest a specific update or change as the culprit.

• Considering user segments, I'm wondering if this affects all users equally. Are we seeing this 15-minute delay consistently across different user types, devices, or regions?

Why it matters: Identifies whether it's a universal issue or limited to specific user groups. Expected answer: It's affecting all users globally. Impact on approach: Universal impact suggests a core system issue rather than a localized problem.

• Given the nature of calendar syncing, I'm curious about the previous sync time. What was the average sync time before this issue arose?

Why it matters: Establishes a baseline for normal performance. Expected answer: Previously, sync times were near-instantaneous or within 1-2 minutes. Impact on approach: Significant deviation from the norm indicates a major system change or failure.

• Thinking about recent updates, have there been any changes to the calendar sync infrastructure or algorithms in the past month?

Why it matters: Could directly link the issue to a specific change or update. Expected answer: Yes, there was a backend update to improve sync efficiency. Impact on approach: If confirmed, this would narrow our focus to recent changes in the sync system.

• Considering user feedback, I'm wondering about the impact on user satisfaction. Have we seen an increase in support tickets or negative feedback related to calendar sync issues?

Why it matters: Gauges the real-world impact and urgency of the problem. Expected answer: Yes, there's been a significant spike in user complaints about sync delays. Impact on approach: High user impact would prioritize quick, temporary fixes while we work on a permanent solution.