JDK 27 promises a lower memory footprint. I ran alf.io, a Spring Boot application, on JDK 25 and on JDK 27 with compact object headers, a Leyden AOT cache and ParallelGC, under the same fixed-rate workload, and measured startup, warm-up, memory and CPU.

How we managed the high load of registrations for Devoxx Belgium.

Cold start can be a big issue with Java Serverless Functions. Native-image is an option, but it doesn’t work in all cases. Let’s explore other possibilities.