使用 druid 连接池，前几次请求总是特别慢，经过 debug 分析：druid 在应用启动时建立的连接，在首次执行请求时，都会进行创建 statement 操作，而这一步耗时特别长。后面再执行请求时，就没有创建 statement 的操作，请求处理的也特别快。

请大佬帮忙分析一下，这个第一次请求耗时是否可以优化？现在应用启动后，前几次请求都特别长，体验非常不好。

应用启动时，druid 创建了连接，这一步符合预期：

2021-07-23 15:32:11.599  WARN 26288 --- [      main] com.alibaba.druid.pool.DruidDataSource  [1243] : removeAbandoned is true, not use in production.
2021-07-23 15:32:11.856 DEBUG 26288 --- [      main] druid.sql.Connection                    [129] : {conn-10001,procId-55682} connected
2021-07-23 15:32:11.957 DEBUG 26288 --- [      main] druid.sql.Connection                    [129] : {conn-10002,procId-55684} connected
2021-07-23 15:32:12.062 DEBUG 26288 --- [      main] druid.sql.Connection                    [129] : {conn-10003,procId-55685} connected

首次请求时，创建 statment 用了将近 200ms，见下面 {conn-10030, pstmt-20000} created 日志，导致首次请求特别慢。

2021-07-23 15:32:28.498 DEBUG 26288 --- [l-thread-1] druid.sql.Connection                    [129] : {conn-10030} pool-connect
2021-07-23 15:32:28.501 DEBUG 26288 --- [l-thread-1] druid.sql.Connection                    [129] : {conn-10030} setAutoCommit false
2021-07-23 15:32:28.670 DEBUG 26288 --- [l-thread-1] druid.sql.Statement                     [134] : {conn-10030, pstmt-20000} created. insert into table_name

2021-07-23 15:32:28.687 DEBUG 26288 --- [l-thread-1] druid.sql.Statement                     [134] : {conn-10030, pstmt-20000} Parameters : [..]
2021-07-23 15:32:28.687 DEBUG 26288 --- [l-thread-1] druid.sql.Statement                     [134] : {conn-10030, pstmt-20000} Types : [VARCHAR, INTEGER]
2021-07-23 15:32:28.700 DEBUG 26288 --- [l-thread-1] druid.sql.Statement                     [134] : {conn-10030, pstmt-20000} executed. 14.004616 millis. insert into table_name

druid 版本：

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.5</version>
        </dependency>

druid 配置：

spring:
  datasource:
    dynamic:
      primary: master                                                                               
      strict: false                                                                                 
      datasource:
        master:                                                                                                                                                             
          url: jdbc:mysql://ip:port/database?useSSL=false&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&useAffectedRows=true&nullCatalogMeansCurrent=true
          username: xxx
          password: xxx                                                                              
          driver-class-name: com.mysql.jdbc.Driver                                                                               
          druid:                                                                                
            default-auto-commit: true                                                                               
            initial-size: 30                                                                                
            min-idle: 30                                                                                
            max-active: 30                                                                              
            test-while-idle: true   
            keep-alive: true                                                                        
            time-between-eviction-runs-millis: 60000
            min-evictable-idle-time-millis: 300000
            max-evictable-idle-time-millis: 900000                                                                         
            connection-init-sqls: SELECT now()                                                                           
            validation-query: SELECT now()                                                                               
            connection-error-retry-attempts: 3                                                                              
            remove-abandoned: true                                                                              
            transaction-query-timeout: 200                                                                 
            max-wait: 100                                                                                                                                                       
            filters: slf4j,wall,stat
            filter:
              slf4j:
                enabled: true
                statement-log-enabled: true
              stat:
                enabled: true
            web-stat-filter:
              enabled: true
              url-pattern: "/*"
              exclusions: "*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*"
            stat-view-servlet:
              url-pattern: "/druid/*"
              reset-enable: false
              login-username: admin
              login-password: admin
              enabled: true
        slave:
          （配置略）

mysql 版本： MySQL 5.7.15