# performance - Paul Piper

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# PERFORMANCE DIRECTORY

2 ENTRIES • TAGS • OPERATIONAL

2026.10.05 → [THE JVM TAUGHT US TIERED COMPILATION](https://www.paul-piper.de/posts/tiered-compilation-jvm-vs-julia/)

I spent fifteen years tuning JVMs for banks, retailers and insurers, and it took building a Julia plugin to notice how much of that tuning HotSpot does for you before you ever touch a flag. The problem HotSpot solves is the one every JIT has: interpreted code starts instantly and runs slow, compiled native code starts slow and runs fast. You cannot have both from the first line. HotSpot’s answer, tiered compilation, has been the default since Java 7, and it works by never picking just one option.

2026.08.12 → [JOOVY - TIERED COMPILATION FOR JULIA](https://www.paul-piper.de/posts/joovy-released/)

[Joovy](https://github.com/ilscipio/joovy) is out - Apache 2.0, on GitHub.

The name is Julia + Groovy. Groovy gave Java a dynamic layer without leaving the JVM. Joovy does the same for Julia.

Background

Education

EBS Business School, SFSU, HSG

Experience

20 Years Enterprise Systems

Built

[Scipio ERP - ERP & Ecommerce System](https://scipioerp.com)

Author

["Start/Up - Set the net on fire"](https://www.amazon.com/dp/B0DDKYNNSJ)

JetBrains

5x Plugins Published

Tech Stack

Languages

Java, Python, JS, TS, Rust, Go, Swift, PHP

Frontend

React, Vue, Angular, HTML/CSS

Databases

PostgreSQL, MySQL, MongoDB

Caching

Redis, Memcached

Key Clients

Enterprise

L'Oréal, Amadeus, Konica Minolta, Orange

Digital

1&1 Internet, Sedo.com, Creditsafe

Public

DRK, Kanton Basel, Aktion Mensch, Börsenverein

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