Same here (though on a 4080). Got it almost fine locked 72fps everywhere now but some Photogrammetry still knocks it out which quite often hitches (small freezes = 0.2 seconds) when turning and I guess it’s loading more detail in. Only happens when turning the AIRCRAFT, not when turning head only. Can’t iron it out but it’s not too bad!
Other PG areas are fine - so it’s hit and miss and doesn’t seem like anything to do with the density necessarily. More to do with optimisation. I don’t know, almost given up. Let’s see if SU15 helps later this week!