wordpress is very slow

My server (ubuntu 14.04  32 bits) with wordpress installed is working in unstable way. My wordpress site is very slow sometimes and my others sites (without worpress) are working fine. I´ve configure php.ini and wp-content.php for 256M.
But still nothing.
Jose BredariolPMPAsked:
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Jason C. LevineNo oneCommented:
What plugins are installed?  

What does the mysql slow queries log report?

Are you usng any form of caching?
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Jose BredariolPMPAuthor Commented:
I have no plugins installed
I have to start myswl_slow_query
How can I know what kind of caching I´m using.
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Jason C. LevineNo oneCommented:
No plugins: OK

Start mysql_slow_query logging and check after using the site for a few minutes.

Caching: if you don't know, the answer is probably "none"

Install and activate the W3 Total Cache plugin and see if it improves things.
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Jose BredariolPMPAuthor Commented:
Thanks all
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