Lately I've been working on improving the performance of an open-source HD graphics plugin for the 21 year old Java game oldschool runescape. I have to say it's

Lately I've been working on improving the performance of an open-source HD graphics plugin for the 21 year old Java game oldschool runescape. I have to say it's completely amazing what this ancient Java code has achieved. Reflection allowed the community to build the client they wanted without needing the company to open source the vanilla client and it runs natively on Windows, Linux, and Mac (Intel and M1). It's also ridiculously fast considering how many layers of abstraction we have piled on top of one another. The only thing that sucks is the way parallelism/concurrency works. It's clunky, race conditions are common and hard to manage, there's a ton of overhead, etc.