🚨 Performance Issue: Email Sending Handler is Too Slow (TTFB ~4s) #2
Description
Summary:
The email-sending handler is taking too long to respond (over 4 seconds) both locally and on AWS Lambda. The biggest delay is in the Time to First Byte (TTFB), which means something is slowing down the server before it starts responding.
📊 Performance Stats
| Metric | Local Value | AWS Lambda Value |
|---|---|---|
| Response Time | 4.18 s | 4.31 s |
| Prepare | 8.96 ms | 12.22 ms |
| Socket Initialization | 1.49 ms | 0.59 ms |
| DNS Lookup | 0.14 ms | 118.48 ms |
| TCP Handshake | 0 ms | 37 ms |
| SSL Handshake | – | 36.52 ms |
| Waiting (TTFB) | 4.18 s | 4.11 s |
| Download | 1.66 ms | 2.41 ms |
| Process | 0.21 ms | 0.23 ms |
🔍 Likely Cause
-
The email sending part (SMTP) is taking too long.
-
This includes:
- Connecting to SMTP server
- TLS handshake
- Authentication
- Waiting for server response
💬 Discussion Prompt
If anyone has:
- Experience with fast email delivery from Go
- Tips for SMTP optimization
- Benchmarks comparing SMTP vs HTTP APIs in Lambda
Feel free to share!