High traffic website - Dedicated server high CPU usage (cpanel/whm)

Hi!

First of all, sorry for my bad english.
I have a dedicated server:
2x Intel Quad Core E5504
16GB DDR3
CentOS 5 (64bit)
(fcgi)
Bandwidth (100Mbps Unmetered)

and my wordpress based website is slown down if there are more than 2500-2700 online user. I have 100K - 150K unique visitor/day.

How can i make my server faster? (I never had dedicated server before)

My.cnf:

[mysqld_safe]
nice 				= -15

[client]
socket 				= /var/lib/mysql/mysql.sock
default-character-set 		= utf8

[mysqld]
## Charset and Collation
character-set-server 		= utf8
collation-server 		= utf8_general_ci

## Files
back_log 			= 300
open-files-limit 		= 8192
open-files 			= 1024	
port 				= 3306
socket 				= /var/lib/mysql/mysql.sock
pid-file 			= /var/lib/mysql/mysql.pid
skip-external-locking
skip-name-resolve

## Logging
datadir				= /var/lib/mysql
relay_log			= mysql-relay-bin
relay_log_index			= mysql-relay-index
#log				= mysql-gen.log	
log_error			= mysql-error.err
log_warnings
log_bin				= mysql-bin
log_slow_queries		= mysql-slow.log
#log_queries_not_using_indexes
long_query_time 		= 10	#default: 10
max_binlog_size 		= 256M	#max size for binlog before rolling
expire_logs_days 		= 4	#binlog files older than this will be purged

## Per-Thread Buffers * (max_connections) = total per-thread mem usage
thread_stack 			= 256K	  #default: 32bit: 192K, 64bit: 256K
sort_buffer_size 		= 1M	  #default: 2M, larger may cause perf issues
read_buffer_size 		= 1M	  #default: 128K, change in increments of 4K
read_rnd_buffer_size 		= 1M	  #default: 256K				
join_buffer_size 		= 1M	  #default: 128K
binlog_cache_size 		= 64K	  #default: 32K, size of buffer to hold TX queries
## total per-thread buffer memory usage: 8832000K = 8.625GB

## Query Cache
query_cache_size 		= 32M	#global buffer
query_cache_limit 		= 512K	#max query result size to put in cache

## Connections
max_connections 		= 100000	#multiplier for memory usage via per-thread buffers
max_connect_errors 		= 100	#default: 10
concurrent_insert		= 2	#default: 1, 2: enable insert for all instances
connect_timeout			= 30	#default -5.1.22: 5, +5.1.22: 10
max_allowed_packet 		= 64M	#max size of incoming data to allow

## Default Table Settings
sql_mode 			= NO_AUTO_CREATE_USER

## Table and TMP settings
max_heap_table_size 		= 1G	#recommend same size as tmp_table_size
bulk_insert_buffer_size 	= 1G	#recommend same size as tmp_table_size
tmp_table_size                  = 1G    #recommend 1G min
#tmpdir                         = /data/mysql-tmp0:/data/mysql-tmp1 #Recommend using RAMDISK for tmpdir

## Table cache settings
#table_cache 			= 512	#5.0.x <default: 64>
#table_open_cache		= 512	#5.1.x, 5.5.x <default: 64>

## Thread settings
thread_concurrency		= 16  #recommend 2x CPU cores
thread_cache_size		= 1000 #recommend 5% of max_connections

## Replication
#read_only
#skip-slave-start		
#slave-skip-errors		= <default: none, recommend:1062>
#slave-net-timeout		= <default: 3600>
#slave-load-tmpdir		= <location of slave tmpdir>
#slave_transaction_retries	= <default: 10>
#server-id                      = <unique value>
#replicate-same-server-id       = <default: 0, recommend: 0, !if log_slave_updates=1> 
#auto-increment-increment       = <default: none>
#auto-increment-offset          = <default: none>
#master-connect-retry           = <default: 60>
#log-slave-updates		= <default: 0 disable>
#report-host			= <master_server_ip>
#report-user			= <replication_user>
#report-password                = <replication_user_pass>
#report-port			= <default: 3306>
#replicate-do-db            	=
#replicate-ignore-db		=
#replicate-do-table		= 
#relicate-ignore-table		=
#replicate-rewrite-db		=
#replicate-wild-do-table	=
#replicate-wild-ignore-table	=

## Replication Semi-Synchronous 5.5.x only, requires dynamic plugin loading ability 
#rpl_semi_sync_master_enabled	= 1 #enable = 1, disable = 0
#rpl_semi_sync_master_timeout	= 1000 #in milliseconds <default: 10000>, master only setting

## 5.1.x and 5.5.x replication related setting. 
#binlog_format			= MIXED

## MyISAM Engine
key_buffer			= 1M	#global buffer
myisam_sort_buffer_size		= 128M	#index buffer size for creating/altering indexes
myisam_max_sort_file_size	= 256M	#max file size for tmp table when creating/alering indexes
myisam_repair_threads		= 4	#thread quantity when running repairs
myisam_recover			= BACKUP	#repair mode, recommend BACKUP 

## InnoDB Plugin Dependent Settings
#ignore-builtin-innodb
#plugin-load=innodb=ha_innodb_plugin.so;innodb_trx=ha_innodb_plugin.so;innodb_locks=ha_innodb_plugin.so;innodb_cmp=ha_innodb_plugin.so;innodb_cmp_reset=ha_innodb_plugin.so;innodb_cmpmem=ha_innodb_plugin.so;innodb_cmpmem_reset=ha_innodb_plugin.so;innodb_lock_waits=ha_innodb_plugin.so

## InnoDB IO Capacity - 5.1.x plugin, 5.5.x
#innodb_io_capacity		= 200

## InnoDB IO settings -  5.1.x only
#innodb_file_io_threads		= 16

## InnoDB IO settings -  5.5.x and greater
#innodb_write_io_threads 	= 16
#innodb_read_io_threads		= 16

## InnoDB Plugin Independent Settings
innodb_data_home_dir            = /var/lib/mysql
innodb_data_file_path		= ibdata1:128M;ibdata2:10M:autoextend
innodb_log_file_size		= 256M	#64G_RAM+ = 768, 24G_RAM+ = 512, 8G_RAM+ = 256, 2G_RAM+ = 128 
innodb_log_files_in_group	= 4	#combined size of all logs <4GB. <2G_RAM = 2, >2G_RAM = 4
innodb_buffer_pool_size		= 10G 	#global buffer
innodb_additional_mem_pool_size	= 4M	#global buffer
innodb_status_file		  	#extra reporting
innodb_file_per_table			#enable always
innodb_flush_log_at_trx_commit	= 2	#2/0 = perf, 1 = ACID
innodb_table_locks		= 0	#preserve table locks
innodb_log_buffer_size 		= 128M 	#global buffer
innodb_lock_wait_timeout 	= 60	
innodb_thread_concurrency	= 16	#recommend 2x core quantity
innodb_commit_concurrency	= 16	#recommend 4x num disks
#innodb_flush_method		= O_DIRECT	   #O_DIRECT = local/DAS, O_DSYNC = SAN/iSCSI
innodb_support_xa		= 0		   #recommend 0, disable xa to negate extra disk flush
skip-innodb-doublewrite

## Binlog sync settings
## XA transactions = 1, otherwise set to 0 for best performance
sync_binlog			= 0

## TX Isolation
transaction-isolation		= REPEATABLE-READ #REPEATABLE-READ req for ACID, SERIALIZABLE req XA

## Per-Thread Buffer memory utilization equation:
#(read_buffer_size + read_rnd_buffer_size + sort_buffer_size + thread_stack + join_buffer_size + binlog_cache_size) * max_connections

## Global Buffer memory utilization equation:
# innodb_buffer_pool_size + innodb_additional_mem_pool_size + innodb_log_buffer_size + key_buffer_size + query_cache_size

[mysqldump]
quick
quote-names
max_allowed_packet 		= 128M

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