Spring Boot 2.4 + Tomcat 9 is serving web page response content extremely slow for first API requests

package app.config;

​

import org.apache.catalina.Context;

import org.apache.catalina.webresources.ExtractingRoot;

import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;

import org.springframework.boot.web.server.WebServerFactoryCustomizer;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

​

@Configuration

public class TomcatConfig {

​

    @Bean

    public WebServerFactoryCustomizer<TomcatServletWebServerFactory> servletContainerCustomizer() {

        return (TomcatServletWebServerFactory container) -> {

            container.addContextCustomizers((Context context) -> {

                // This configuration is used to improve initialization performance.

​

                context.setResources(new ExtractingRoot());

                context.setReloadable(false);

            });

        };

    }

}