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Knowledge Base

WordPress website is loading slow: slow admin-ajax.php and high TTFB

 
applications extensionsdomainshttpsperformancephp

Symptoms

  • WordPress website works slowly.

  • Some sections of the website return 404 error.
  • https://example.com/wp-admin/admin-ajax.php also works slowly.

  • High TTFB can be observed:

    # # curl -s -w 'nLookup time:tt%{time_namelookup}nConnect time:tt%{time_connect}nSSL handshake time:t%{time_appconnect}nPre-Transfer time:t%{time_pretransfer}nRedirect time:tt%{time_redirect}nStart transfer time:t%{time_starttransfer}nnTotal time:tt%{time_total}n' -o /dev/null http://example.com
    Lookup time: 0.055
    Connect time: 0.224
    SSL handshake time: 0.000
    Pre-Transfer time: 0.225
    Redirect time: 0.000
    Start Transfer time: 1.395
    Total time: 0.395

    Note: A high value can be considered when the substraction of "Start Transfer" value from the "Pre-Transfer" value is more than 1 second.

Cause

Some WordPress plugins affect the website performance.

Resolution

  1. Log in to Plesk.

  2. Disable plugins (for example WP-SpamShield) one by one to find the cause in Domains > example.com > WordPress > Plugins > Deactivate button, or completely remove the Plugin from the Trash icon:

    Screen_Shot_2019-03-28_at_18.09.24.png

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