pagespeed – Slow ReadFile operation on file

[Sat May 27 07:17:27.539747 2017] [pagespeed:error] [pid 19961] [mod_pagespeed 1.11.33.5-0 @19961] Slow ReadFile operation on file /var/cache/mod_pagespeed/rname/ic_QOs6thfRpiBUn09lB5Du/http,3A/,2Fdomain.com/assets/slideshow/slide_02.jpg,40x,40._,: 59.944ms; configure SlowFileLatencyUs to change threshold\n

 

Some disk stats….

sudo hdparm -Tt /dev/root

/dev/root:
 Timing cached reads: 26330 MB in 2.00 seconds = 13178.47 MB/sec
 Timing buffered disk reads: 540 MB in 3.00 seconds = 179.73 MB/sec

I’v added the following lines to my pagespeed configuration file (/etc/apache2/mods-enabled/pagespeed.conf)

ModPagespeedSlowFileLatencyUs 100

 

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