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Compare the response time of a PHP page with a static file

harmlessImages and performancedebian, ubuntu
Adjust the values, the command updates live
user@server
for u in https://example.com/ https://example.com/wp-includes/css/dist/block-library/style.min.css; do curl -o /dev/null -s -w "%{time_starttransfer}s TTFB  $u\n" "$u"; done

Requests a PHP-generated page and a static file from the same domain one after the other. If the static file is fast and the PHP page slow, the problem lies in PHP, the database or plugins. If both are slow, the network, TLS or an overloaded web server are more likely the cause.

Note: Multiple runs smooth out outliers, see the entry on measuring TTFB repeatedly. A page cache can make the PHP page appear faster than it is without the cache.

Also searched as

  • is php or the server slow
  • narrow down slow wordpress response time
  • ttfb dynamic vs static
  • why is my website slow

Related one-liners

All in Images and performance

Measure TTFB repeatedly with minimum, median and maximum

$for i in $(seq 10); do curl -o /dev/null -s -w '%{time_starttransfer}\n' https://example.com/; done | LC_ALL=C sort -n | awk '{a[NR]=$1; s+=$1} END {printf "Min: %.3fs Median: %.3fs Max: %.3fs Schnitt: %.3fs\n", a[1], a[int((NR+1)/2)], a[NR], s/NR}'
harmlessSEO checks

Detect the web server and PHP version from HTTP headers

$curl -sI https://example.com/ | grep -iE "^(server|x-powered-by|via):"
harmlessnginx

Measure HTTP load times and TTFB with curl

$curl -o /dev/null -sS -w 'DNS: %{time_namelookup}s Connect: %{time_connect}s TLS: %{time_appconnect}s TTFB: %{time_starttransfer}s Gesamt: %{time_total}s\n' https://example.com/
harmlessNetwork

Check Cache-Control of all CSS, JS and image files on a page

$curl -s https://example.com/ | grep -oE '(src|href)="[^"]+\.(css|js|woff2?|jpe?g|png|gif|webp|avif|svg)(\?[^"]*)?"' | cut -d'"' -f2 | sed -E 's#^//#https://#; s#^/#https://example.com/#' | grep '^http' | sort -u | while read -r a; do printf '%-45s %s\n' "$(curl -sI "$a" | grep -i '^cache-control:' | tr -d '\r')" "$a"; done
harmlessImages and performance

Check HTTP/3 support via the Alt-Svc header

$curl -sI https://example.com/ | grep -i '^alt-svc'
harmlessImages and performance

Find images without a loading attribute on a page

$curl -s https://example.com/ | tr '\n' ' ' | grep -oiE '<img[^>]*>' | grep -vi 'loading='
harmlessImages and performance

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