What's causing the sudden 30% increase in compile times for large Unity projects using the latest version of the editor?

Introduction

The sudden 30% increase in compile times for large Unity projects using the latest editor version is a critical issue that demands immediate attention. This performance degradation can significantly impact developer productivity and project timelines. 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 related to a recent Unity update. Has there been a major version release or patch in the last few weeks?

Why it matters: Recent updates often introduce changes that can affect performance. Expected answer: Yes, there was a recent update. Impact on approach: If confirmed, we'd focus on changes in the new version.

• I'm curious about the project sizes affected. Are we seeing this 30% increase across all large projects, or is it more pronounced in projects with specific characteristics?

Why it matters: This helps us narrow down potential causes related to project structure or content. Expected answer: The issue is more prevalent in projects with certain features or asset types. Impact on approach: We'd investigate those specific project elements more closely.

• Considering user segments, are we seeing this issue across all development environments, or is it more pronounced on certain hardware configurations or operating systems?

Why it matters: This could indicate whether the problem is universal or environment-specific. Expected answer: The issue is more severe on certain hardware or OS combinations. Impact on approach: We'd focus on those specific environments for further investigation.

• I'm wondering about any changes in how compile times are measured. Has there been any recent modification to the compilation process or how it's timed?

Why it matters: This ensures we're comparing apples to apples in our metrics. Expected answer: No changes to the measurement process. Impact on approach: If there were changes, we'd need to re-evaluate our baseline metrics.