MVC 架构设计模式会影响 MySQL 数据库性能吗？

我们目前的站点完全是在mvc架构的cakePHP框架中开发的。如果我们注意到超过 19-20 个用户同时查看该网站，它就会开始爬行并开始超时。

这可能是 MySQL 的性能问题吗？可能与 MVC 有关——因为该站点严重依赖与 SQL 数据库的通信。如果是这样，增加整体 RAM 是否有助于解决问题？

谢谢。

配置：

open-files-limit                = 20000

#sql-mode                       = TRADITIONAL

#event-scheduler                = 1

### Cache
thread-cache-size               = 16
table-open-cache                = 2048
table-definition-cache          = 512

query-cache-size                = 32M
query-cache-limit               = 1M

### Per-thread Buffers
sort-buffer-size                = 1M
read-buffer-size                = 1M
read-rnd-buffer-size            = 8M
join-buffer-size                = 1M

### Temp Tables
tmp-table-size                  = 64M 
max-heap-table-size             = 64M

### Networking
back-log                        = 100
max-connections                 = 300
max-connect-errors              = 10000
max-allowed-packet              = 16M
interactive-timeout             = 600
wait-timeout                    = 60
net_read_timeout        = 30
net_write_timeout       = 30
# This value is the size of the listen queue for incoming TCP/IP connections.
back_log            = 128

#### Storage Engines
#default-storage-engine         = InnoDB

## Makes sure MySQL does not start if InnoDB fails to start. This helps
## prevent ugly silent failures.
innodb                          = FORCE

### MyISAM
key-buffer-size                 = 64M
myisam-sort-buffer-size         = 128M

#InnoDB
innodb-buffer-pool-size         = 16M
innodb-log-buffer-size          = 4M
innodb-log-files-in-group      = 2

server-id                       = 1

[mysqld-safe]
log-error                       = /var/log/mysqld.log

[mysqldump]
max-allowed-packet      = 16M