Ok, please hear me out before shouting "AI slop!".
Unfortunately, we all know that Elten is horribly slow. If the open sourced code was up to date and the server wasn't missing, I'd already do it myself, but since it isn't, here my suggestion.
Would it be so bad running Copilot, Claude or ChatGPT over this and see what it can improve in terms of readability, maintenance effort and especially speed? I personally think that the coding abilities of Claude are underrated and overhated. As long as one knows the basics about how to prompt, wonders can be achieved.
Elten, however, is a huge platform, so of course each edit would ned to undergo careful review or weeks of beta testing, however, I am quite positive that eventually, Claude or another coding assistant could improve both resource usage, fix known bugs, the code disaster and - of course - the speed.
Maybe, with enough prompting effort, a migration to true Rubi or another language can even be completed within one or two weeks of Claude code on the pro plan.
See me as AI simp if you want, but I personally just see a huge potential especially for such simple yet annoying tasks such as lag reduction, but also for way more complex things.

I actually agree, if used correctly, AI can really help in this scenario.