Optimization for a VPS 4GB running multiple wordpress sites

[yellowfrog]

Hello

i have a 4GB VPS with LS/cpanel and 100WP Blogs.

Now I have problems since 2 weeks with the server load Up to 30.
where I can begin to reduce the server load.

in what configs I need to make settings ?


my.cnf

PHP Code:

[mysqld]
local-infile=0
datadir=/var/lib/mysql
query_cache_limit=3M
query_cache_size=256M ## 32MB for every 1GB of RAM
query_cache_type=1
max_user_connections=25
max_connections=50
interactive_timeout=30
wait_timeout=120
connect_timeout=20
thread_cache_size=128
key_buffer=128M ## 128MB for every 1GB of RAM
join_buffer=1M
max_connect_errors=20
max_allowed_packet=16M
tmp_table_size=256MB
max_heap_table_size=256MB
table_cache=4096
sort_buffer_size=1M ## 1MB for every 1GB of RAM
read_buffer_size=1M ## 1MB for every 1GB of RAM
read_rnd_buffer_size=4M  ## 1MB for every 1GB of RAM
thread_concurrency=2 ## Number of CPUs x 2
myisam_sort_buffer_size=64M
server-id=1
innodb_buffer_pool_size=2G

#slow_query_log = /var/log/mysql_slow_queries.log
log_slow_queries = /var/log/mysql/mysql-slow.log
long_query_time = 2
log-queries-not-using-indexes
# this can be used on your own wish.
#collation-server=latin1_general_ci

[mysql.server]
user=mysql

[safe_mysqld]
err-log=/var/log/mysqld.log
pid-file=/var/lib/mysql/mysql.pid
open_files_limit=10240

[mysqldump]
quick
max_allowed_packet=16M

[mysql]
no-auto-rehash
#safe-updates

[isamchk]
key_buffer=32M
sort_buffer=32M
read_buffer=2M
write_buffer=2M

[myisamchk]
key_buffer=32M
sort_buffer=32M
read_buffer=2M
write_buffer=2M

[mysqlhotcopy]
interactive-timeout