Render dragon and FPS

hello I come to report a bug that I found on version 1.18.30 that I did last night and that I tested, to warn you that there is more lag than on the version before and I would like to recover but 120 fps that I had before, and also on the previous version I could play at 16 chunks without lag and the at 12 chunks I lag more than before so please do something because I love your games and would like not to have lag on but survival thank you.