Hey,
try to read the faq´s, i also had issues on my first two flights and thought wow what a mess.
But currently i´m on a long haul from EDDM to OMDB and the plane works like a charm in MSFS2024, sure the need to fix some things.
GSX Loading,... but for me the rest is working fine now.
As mentioned needed two tries now it`s working since 5 hours as expected.
Performance wise I had about 50 FPS on ground in EDDM with FSTL Traffic (60 Planes). But I currently use the model without cabin is I dont`t go to the cabin.