PostgreSQL open connection takes too long - spring

Question

I am currently developing a project using the following libs/frameworks:
hibernate: 5.2.11.Final
spring: 5.0.2.RELEASE
postgresql: 9.4.1212
mysql: 5.1.31
spring-data-jpa: 2.0.2.RELEASE
The project should be available in both Postgres and mysql. I am also using a profiler program called "Prefix" to track possible performance issues.
I realized that all my queries on postgresql were taking longer than the ones made on mysql, so I decided to look on profiler what was the issue.
Whenever I tried to establish a new connection to the database on mysql (DriverManager.getConnection), it took something between 5~10ms, and the same connection to postgresql is taking about 200ms+.
Do you guys know what could be making driver connections on postgresql take longer than mysql?
Here is how the db is configured:
public DataSource dataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
...
dataSource.setDriverClassName(org.postgresql.Driver);
...
}
private Properties hibernateProperties() {
Properties properties = new Properties();
properties.put("spring.jpa.hibernate.ddl-auto", props.getHibernateJPAAutoConfig());
if (props.getDatabaseName().equals(ProjectConstants.DATABASE_POSTGRE)) {
properties.put("spring.jpa.properties.hibernate.dialect", "org.hibernate.dialect.PostgreSQL9Dialect");
properties.put("spring.jpa.properties.hibernate.jdbc.use_get_generated_keys", true);
properties.put("spring.jpa.properties.hibernate.temp.use_jdbc_metadata_defaults", false); //started using those properties because I read that it could make postgresql connections faster; however it did not work.
}
return properties;
}
public EntityManagerFactory entityManagerFactory() {
LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
factory.setDataSource(dataSource());
factory.setJpaProperties(hibernateProperties());
...
}