React Email Engineering Benchmarks

Resend · GitHub · Updated July 28, 2026

React Email delivery benchmarks are based on 46 merged pull requests in the last 30 days (499 all-time), with 3.5 hours median cycle time, 0.1 hours median review time, and 8 active contributors. AI-related signals appear on 71.7% of recent work. PR volume is up 84% compared to the prior period.

Median Cycle Time
3.5h
PR open to merge
Median Review Time
0.1h
first review to approval
AI-Related Signals
71.7%
directional signal across recent PRs
Best Signal Fast Delivery
3.5h
Median cycle time of 3.5h

Repo vs Resend Average

-16.9pp
AI Signals
+2.6h
Cycle Time
+0.0h
Review Time

Delivery Trend and AI Signals

PR Backlog (Humans)

Excludes AI agents and automation accounts.

PR Backlog (AI Agents)

AI coding agents only.

Cycle Time by AI-Related Signals

54.6h
with signals
32.0h
baseline
70.4%
difference

PR Breakdown

43 with signals / 52 total PRs

Top AI Tools

cubic 37
cursor 2

PR Type Breakdown

bugfix 16
chore 14
unknown 8
feature 5
docs 2
ci 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 27 minutes ago.

Updated daily from public GitHub pull requests.

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