我有个问题。我的网站很慢，我觉得是mysql。最多用户连接100个用户。大多数情况下30-40人。
我的服务器：
英特尔至强e3-1230v3
16 gb ddr3内存
240 gb ocz ssd磁盘
centos 7 whm公司
...

PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
12496 mysql   20   0   14.1g   1.3g  12228 S 576.1  8.2 116:38.62

/usr/sbin/mysqld公司
/etc/my.cnf公司：

port        = 1905
socket      = /var/lib/mysql/mysql.sock

# The MySQL Safe server

[mysqld_safe]
open_files_limit = 58000

# The MySQL server

[mysqld]
max_connections = 300
local-infile    = 0
socket      = /var/lib/mysql/mysql.sock
skip-external-locking
key_buffer_size = 1024M
table_open_cache = 4096
open_files_limit = 40960
max_allowed_packet=1073741824
sort_buffer_size = 4M
read_buffer_size = 4M
join_buffer_size = 4M
sort_buffer_size = 4M
read_rnd_buffer_size = 128M
myisam_sort_buffer_size = 128M
thread_cache_size = 16

# query_cache_size= 32M

tmp_table_size = 64M
max_heap_table_size = 64M

# table_cache    = 1024

# Slowly log

slow-query-log = 1
slow-query-log-file = /var/lib/mysql/mysql-slow.log
long_query_time = 1

# Uncomment the following if you are using InnoDB tables

innodb_file_per_table= 1

# innodb_data_home_dir = /var/lib/mysql

# innodb_data_file_path = ibdata1:50M:autoextend

# innodb_log_group_home_dir = /var/lib/mysql

# You can set .._buffer_pool_size up to 50 - 80 %

# of RAM but beware of setting memory usage too high

innodb_buffer_pool_size = 8096M

# innodb_additional_mem_pool_size = 64M

# Set .._log_file_size to 25 % of buffer pool size

# innodb_log_file_size = 64M

# innodb_log_buffer_size = 8M

# innodb_flush_log_at_trx_commit = 1

# innodb_lock_wait_timeout = 50

# Connection Settings

wait_timeout = 60
skip-external-locking

[mysqldump]
quick
max_allowed_packet = 64M

[mysql]
no-auto-rehash

# Remove the next comment character if you are not familiar with SQL

# safe-updates

[myisamchk]
key_buffer_size = 512M
sort_buffer_size = 256M
read_buffer = 8M
write_buffer = 8M

# Query Cache Settings

query_cache_type = 1
query_cache_limit = 256K
query_cache_min_res_unit = 2k
query_cache_size = 80M
skip-external-locking

[mysqlhotcopy]
interactive-timeout

我怎么做这个问题？
谢谢。