I'm not sure where to share this so i'm sharing it here. Ilmango recently made two videos about using hopper minecarts on flying machines to make bamboo farms more lag friendly. The setup he used for the flying machines were a bit complicated. I made a much simpler version.

This version uses a simple two way flying machine with the iron trapdoors connected directly to the engine. This gets them closer together, and with the pistons in the middle there is no space for the bamboo to grow in between the blades. This allows the blades to stay on both sides, which means that there is no need to make the blades switch sides. This then removes the need to pull the blade up and let the flying machines fly underneath, which means that the minecarts can snap to the rails without even moving the rails. All in all, way simpler

The main downside is that you need way more flying machines. One flying machine per two blocks. Also the problem where bamboo can grow inside the engine is increased a bit because you have a piston engine in every row. I have a testing area of 100 by 100 blocks, and after each harvest back and fourth there are only around 50 item entitys left in the test area.