I had the same issue, when flying Hind on multiplayer 4YA Syria map. I turned OFF "Shadows" > issue solved. Before I had "Shadows" set to "HIGH" , "Flat Shadows blur" to OFF , "Secondary Shadows" OFF and was getting the 1 to 5 second stutter as mentioned above with the latest update. Although when flying with Hornet on same map with "Shadows" on, all was fine.
I play on 4K, 32gb RAM, rtx3070 8gb, i5 12400, ssd disk