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Why is Concrete5 so Slow?

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I have a site design in C5. It's terribly slow.
http://glchristiancenter.org/

I've looked into basic issues(image sizes, consolidated scripts etc)

I tend to follow my best practices best I can, but this site seems to be a nightmare.

I have another sitehttp://signcraft-ga.com/ that performs better, yet it's more graphic intensive.

Thoughts?
 
Steevb replied on at Permalink Reply
Steevb
You a have few issues.

Use:http://www.webpagetest.org/

Helps to identify areas that need improvement.
helmut replied on at Permalink Reply
helmut
You might try to improve the speed of your website by either setting one of the the following two options under 
Dashboard -> System & Settings -> Cache & Speed Settings

# Setting turns off caching and fetches everything  from the database. Helps if you have a fast database.
Basic Cache: off
Overrides Cache: off
Full Page Caching: off

or
# Setting turns on full caching
Basic Cache: on
Overrides Cache: on
Full Page Caching: on
Full Page Cache Rebuild: Manually cleared (important!)

The latter setting I do use for my public site. The first one for my test site.
Steevb replied on at Permalink Reply 4 Attachments
Steevb
Here are some images of why you have slow page loads and error indicators.

See attached.
Adreco replied on at Permalink Reply
Adreco
I see your two sites use different versions of C5 (5521 & 5602) and this could be contributing to some of the performance difference. I have two sites exceptionally similar (site 2 cloned off of 1 then modified). Site 2 I manually upgraded to the beta 5.6.1b3 and saw a freakish improvement in speed... (Okay, maybe not freakish but noticeably faster!)
Consider upgrading to 5.6.1 when your site is optimized.