Magento very slow loading since upgrade to 1.9.1

[gregyk]

Hello to all!

I have problem, that magento CE gets very slow if I upgrade it from v1.7 to 1.9.1.  

I get aprx. 8 seconds just to show first page, on v1.7 this is max. 2 seconds.

Can you point me in which direction should I explore and what should I check?

I deleted all in cache folder, I cleaned cache and reindexed - but situation was the same.

Thanks!

[Daniel Sousa]

Hi,

without access to the webstore I can't say very mutch, but you can start checking the logs (var/logs/) to see if there is any error/warning messages.

Them you can use some tools like Yslow to check if you can make some improvements.

[gregyk]

I checked var/logs and there is no errors. Page is working ok, but incredably slow... I will try yslow...

[Daniel Sousa]

If you are running on apache server you can try to increase memory limit on .htaccess.

php_value memory_limit

[gregyk]

Tried also that, no change ...

[KentChr_DK]

A couple of thoughts:

Server setup / hosting ?

Theme installed ?

Modules / extensions ?

Are all these up to date with the version 1.9.x ?

[gregyk · Accepted solution]

We resolved this with APC cache - now it's ok.

[A P W Trading]

If you have resolved this with APC Cache then you may want to consider Redis as your next step,

You can use Redis Cache for both backend cache & sessions, this can have a significant performance increase over APC