React Email Engineering Benchmarks

Resend · GitHub · Updated October 26, 2026

React Email delivery benchmarks are based on 15 merged pull requests in the last 30 days (557 all-time), with 63.4 hours median cycle time, 58.8 hours median review time, and 8 active contributors. AI-related signals appear on 80.0% of recent work. PR volume is down -32% compared to the prior period.

Median Cycle Time
63.4h
PR open to merge
Median Review Time
58.8h
first review to approval
AI-Related Signals
80.0%
directional signal across recent PRs
Best Signal AI Adoption
80%
80% of PRs are AI-assisted
Watch Out Review Pressure
58.8h
Median review time is 58.8h

Repo vs Resend Average

-8.0pp
AI Signals
+62.3h
Cycle Time
+58.7h
Review Time

Delivery Trend and AI Signals

PR Backlog (Humans)

Excludes AI agents and automation accounts.

PR Backlog (AI Agents)

AI coding agents only.

AI Signals vs Cycle Time

Correlation

moderate negative
r = -0.44 (11 weeks)

Cycle Time by AI-Related Signals

86.7h
with signals
59.9h
baseline
44.7%
difference

PR Breakdown

12 with signals / 15 total PRs

Top AI Tools

cubic 14
claude_code 3
ai_generic 1

PR Type Breakdown

unknown 14
chore 1

Methodology

Metrics are computed from merged pull request data synced daily from GitHub. AI-related metrics are directional signals inferred from pull request activity patterns and heuristics. Summary metrics use a 30-day rolling window; trends use a 90-day window. Last updated 2 hours, 46 minutes ago.

Updated daily from public GitHub pull requests.

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