🚨 Performance Issue: Email Sending Handler is Too Slow (TTFB ~4s)

[ajaynegi45]

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.

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📊 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

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🔍 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!