My website suddenly very slow?

[joymax27104000]

Hello,

I don't know why My website suddenly very slow?
This is my server:

Server: HP DL180G6
CPU:2x Intel Quad-Core Xeon E5620
RAM:8GB
Harddisks:4x1TB SATA
RAID (HW/SW):RAID 10
Connectivity: Volume
Bandwidth:70TB
Uplink: GEV
IPv4/IPv6:1
SLA:Basic
OS: Centos 6 64bit:
Partitioning: Default
Control Panel:cPanel/WHM

At this time, I have 400 files = ~450 GB.
Online: 10 user (amung stats)

and very very very slow. When I try enable "Maintenance page", my site will fast again. But why? I think my server is strong

Thanks for helping.

 

[joymax27104000]

Speed download still very good, but speed for website is very slow, very bad

 

[ysmods]

Tried restarting apache/MySQL/Server?

 

[joymax27104000]

yes, i did, but still slow, only 10 users online, very strange for me

 

[uprv]

Well, I would recommend you to use mysqltuner to optimize MySQL, usually this helps a lot.

Which webserver do you use?

Did you tried to optimize the database at phpMyAdmin?

Which server provider you use?
(Some are using bad parts...)

 

[dfdssfsfd3806]

I advise you to empty the session without user name is her that is heavy I met him but my server was overloaded as