Druid 监控 耗性能么 cpu 内存占用怎么看？

1、最近项目用上了Druid连接池，发现它还有监控整个应用的功能。但是不知道这个监控性能怎么样？监控功能对cpu 内存使用 怎么查看？
web.xml

<filter>

<filter-name>DruidWebStatFilter</filter-name>
<filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
<init-param>
  <param-name>exclusions</param-name>
  <param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>
</init-param>

</filter>
<filter-mapping>

<filter-name>DruidWebStatFilter</filter-name>
<url-pattern>/*</url-pattern>

</filter-mapping>
<!--Druid 监控信息展示-->
<servlet>

<servlet-name>DruidStatView</servlet-name>
<servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
   
<init-param>  
    <!-- 用户名 -->  
    <param-name>loginUsername</param-name>  
    <param-value>2121</param-value>  
</init-param>  
<init-param>  
    <!-- 密码 -->  
    <param-name>loginPassword</param-name>  
    <param-value>2121</param-value>  
</init-param> 
<init-param>
  <param-name>resetEnable</param-name>
  <param-value>false</param-value>
</init-param>

</servlet>
<servlet-mapping>

<servlet-name>DruidStatView</servlet-name>
<url-pattern>/druid/*</url-pattern>

</servlet-mapping>