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Pagespeed error

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A few months ago I tried out pagespeed but swiftly turned it off as I received the following error when viewing a topic. Does anyone know the cause of this?

The requested URL /forums/uploads/monthly_2016_08/x57c4027e2dfcc_CDTyRuUWgAAMIYR_jpglarge.thumb_5eb8004b1b0ed228d7bbbe34c81cc6a3.f14d68dd22c754681c55bfd49cb09fea.pagespeed.ic.zL7bjiTkv5.webp was not found on this server. error.


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20 hours ago, marklcfc said:

Sorry I meant mod_pagespeed

Quote from the same site:

"I am getting 404s for rewritten resources (like example.png.pagespeed.ic.LxXAhtOwRv.png) or for the mod_pagespeed_admin console

The most common reason that the rewritten resources 404 is because of mod_rewrite RewriteCond rules. For example:

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^ /404 [L,R=301]

This rule causes 404 for all requests which don't exist on the filesystem, including mod_pagespeed rewritten resources and the mod_pagespeed admin console.

In order to fix this you must add an exception for mod_pagespeed URLs:

  RewriteCond %{REQUEST_URI} !pagespeed

This will allow rewritten resources, the admin console and static resources necessary for some filters."

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I don't use mod_pagespeed,  but if this is true:

"mod_pagespeed is built on PageSpeed Optimization Libraries, deployed across 100,000+ web-sites, and provided by popular hosting and CDN providers such as DreamHost, GoDaddy, EdgeCast, and others. There are 40+ available optimizations filters, which include:

- Image optimization, compression, and resizing

- CSS & JavaScript concatenation, minification, and inlining

- Cache extension, domain sharding, and domain rewriting

- Deferred loading of JavaScript and image resources

and many others..."

should not use mod_deflate.c.

I personally would not use mod_pagespeed. I look at this mod with great skepticism.


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Those are just the advertisements. In my browser when I view the site in a user group that sees no adverts, the speed is more or less the same and not noticeably faster which some other forums tend to be.

My main issue is it is so much slower/sluggish when logged in - so can't be an issue with the adverts here as logged in members see less.

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