https://devops-monk.com/tags/performance/Recent content in Performance on Devops MonkHugoen-usSun, 03 May 2026 00:00:00 +0000https://devops-monk.com/tutorials/spring-boot/spring-boot-async-virtual-threads/Sun, 03 May 2026 00:00:00 +0000https://devops-monk.com/tutorials/spring-boot/spring-boot-async-virtual-threads/Not every operation needs to complete before the response returns. Sending an email, generating a report, publishing an event — these can run in the background. Async processing keeps request latency low while the work continues. @Async — Fire and Forget @SpringBootApplication @EnableAsync public class OrderServiceApplication { } @Service @Slf4j public class NotificationService { @Async // runs in a separate thread public void sendOrderConfirmation(Order order) { log.info("Sending confirmation for order {}", order.https://devops-monk.com/tutorials/spring-boot/spring-boot-caching/Sun, 03 May 2026 00:00:00 +0000https://devops-monk.com/tutorials/spring-boot/spring-boot-caching/Caching sits between your application and the database. A cache hit returns data in microseconds; a database query takes milliseconds. For frequently-read, infrequently-changed data, caching is the highest-leverage performance improvement. Spring Cache Abstraction Spring’s cache abstraction lets you add caching with annotations — the backing store (Caffeine, Redis, Hazelcast) is swappable: @Service @RequiredArgsConstructor public class ProductService { private final ProductRepository repository; @Cacheable("products") // cache the result public Product findById(UUID id) { return repository.https://devops-monk.com/2026/05/spring-boot-graalvm-native-images/Sun, 03 May 2026 00:00:00 +0000https://devops-monk.com/2026/05/spring-boot-graalvm-native-images/Spring Boot applications running as GraalVM native images start in milliseconds, use a fraction of the memory, and fit in tiny containers. The tradeoff is a longer build time. In 2026, with Spring Boot 4 and GraalVM 24, native images are production-ready for most Spring applications. This guide covers everything: what Spring AOT does, how to build your first native image, how to fix the common issues, and how to add native builds to CI.https://devops-monk.com/tutorials/spring-boot/spring-boot-graalvm-native/Sun, 03 May 2026 00:00:00 +0000https://devops-monk.com/tutorials/spring-boot/spring-boot-graalvm-native/A regular Spring Boot application takes 2–10 seconds to start. A GraalVM native image of the same application starts in under 100 milliseconds. For serverless functions, batch jobs, and CLI tools, this is the difference between viable and unusable. What Is a Native Image? GraalVM’s native image compiler performs ahead-of-time (AOT) compilation. Instead of shipping a JAR that the JVM interprets at runtime, you ship a standalone executable that: Contains only the code your application actually uses Has no JVM startup overhead Uses much less memory (no JIT compiler, no class metadata) Starts in milliseconds The tradeoff: compile time increases from seconds to minutes.https://devops-monk.com/tutorials/spring-boot/spring-boot-jpa-performance-tuning/Sun, 03 May 2026 00:00:00 +0000https://devops-monk.com/tutorials/spring-boot/spring-boot-jpa-performance-tuning/JPA makes data access easy — until it silently runs hundreds of queries to load what you think is a single query. This article covers how to find and fix the most common JPA performance problems. Enable Query Logging First You can’t fix what you can’t see. Enable SQL logging before optimizing: logging: level: org.hibernate.SQL: DEBUG org.hibernate.orm.jdbc.bind: TRACE # log bind parameters (Spring Boot 3+) spring: jpa: properties: hibernate: format_sql: true generate_statistics: true # log query count, cache hits, etc.https://devops-monk.com/2026/05/spring-boot-caching-caffeine-redis/Sun, 03 May 2026 00:00:00 +0000https://devops-monk.com/2026/05/spring-boot-caching-caffeine-redis/Caching reduces database load and response latency. Spring Boot’s cache abstraction lets you add caching with annotations, then swap the implementation (Caffeine, Redis, multi-level) without changing your business code. This guide covers Caffeine for in-JVM caching, Redis for distributed caching, and a multi-level cache that combines both. Spring Cache Abstraction Spring’s cache abstraction uses three annotations: Annotation Behaviour @Cacheable Cache the return value. On subsequent calls, return from cache without executing the method.https://devops-monk.com/2026/05/spring-boot-jpa-performance/Sun, 03 May 2026 00:00:00 +0000https://devops-monk.com/2026/05/spring-boot-jpa-performance/JPA makes database access simple. It also makes it dangerously easy to write code that fires 100 SQL queries to load 10 records. The N+1 problem alone has caused more production performance incidents than almost any other JPA issue. This guide covers how to find and fix the five most common JPA performance problems: N+1 queries, LazyInitializationException, over-fetching, poor connection pool sizing, and Hibernate 6 breaking changes. Enable SQL Logging First Before optimizing anything, see exactly what queries are firing:https://devops-monk.com/2026/05/spring-boot-virtual-threads/Sun, 03 May 2026 00:00:00 +0000https://devops-monk.com/2026/05/spring-boot-virtual-threads/Virtual Threads landed in Java 21 as a stable feature, and Spring Boot 3.2 added first-class support with a single property. The promise: write simple blocking code and get WebFlux-level throughput. The reality is mostly true — with some important exceptions. This article covers what Virtual Threads actually are, how to enable them in Spring Boot, real benchmark numbers, the three pitfalls that will silently destroy your performance, and a decision framework for when to use them (and when not to).https://devops-monk.com/2026/05/spring-boot-vs-quarkus/Sun, 03 May 2026 00:00:00 +0000https://devops-monk.com/2026/05/spring-boot-vs-quarkus/Every year, someone asks: “Should we use Spring Boot or Quarkus?” In 2026, both frameworks are mature, both run natively, and both work well on Kubernetes. The differences come down to developer experience, ecosystem size, and specific performance characteristics. This is an honest comparison with real numbers, not marketing claims. The Frameworks at a Glance Spring Boot 4 (November 2025): Built on Spring Framework 7. The de-facto standard for enterprise Java.