Hey there!
First off I want to say your mod is awesome. I have no idea how you pulled it off but, at least for me, you have succeeded in making meaningful performance improvements, in particular for chunk loading. I thought you would like to know that it appears something happened during the update from 1.21 to 1.22 that broke the MC Helicopters mod. I discovered that when using 1.23, the cockpit interface of MC Helicopters vehicles would stutter as soon as the vehicle begins moving. I have personally tested this with the "F35A Lightning II" and a few more vehicles and have come up with this issue. The same issue appears in 1.22 but is not there in 1.21. Also, using optifine fixes the issue for all tested versions, but using optifine is not an option for me due to its buginess. If you want to test it yourself, the page to download the mod from is the original japanese language forum, I can give you a link if you want. If there is any more help I can provide feel free to message me. Thanks!