SLC: quickly compare web performance across multiple domains

SxLoadCheck

SxLoadCheck is a GPL-licensed Bash script for quickly comparing web performance (DNS, TLS, TTFB) across multiple domains. It can also optionally carry out full DNS diagnostics.

I use it from my workstations through the “slc” command in /usr/local/bin

Main features

– Simultaneous analysis of multiple domains (using `curl`).
– Detailed display: DNS lookup, TLS handshake, TTFB.
– Checks the validity of the supplied FQDNs.
– Lightweight DNS diagnostics: resolution time, TTL, NS.
– Advanced DNS diagnostics: trace, glue records, SOA/A records.

Usage

slc.sh --domains exemple1.com,exemple2.com

With quick DNS diagnostics:

slc.sh --domains exemple1.com,exemple2.com --dns-check

With full (deep) DNS diagnostics:

slc.sh --domains exemple1.com,exemple2.com --deep-dns

Example error for an invalid FQDN:

Error: the following entries are not valid FQDNs:
  - invalid_domain

Options

--domains     Liste de domaines séparés par virgules (obligatoire)
--dns-check   Active un diagnostic DNS léger
--deep-dns    Lance un diagnostic DNS complet
--help, -h    Affiche l'aide

Requirements

– `curl`
– `dig`
– `whois` (for some advanced options)

Todo list

– Add a `–threshold` option to raise an alert if TTFB > x sec.
– Add a `–headless` mode for silent runs.

Resources

– Script: slc.sh