This is a really cool plugin and its execution is amazing, however it will absolutely obliterate tps, I would really like to see more development on this plugin as its a cool idea, but could do with some behind the scenes optimisation. (Also plugin suggestion, could you make it that when a player is standing next to the conveyor it moves you upwards?)

Would I recommend this plugin?

Yes and no, its really fun to play around with, and the player movement and item movement is really smooth, so credit to the developer there, however as I mentioned above it obliterates tps (attached is a snipet of my timings report)

ConveyorBelts (v1.0.0)
Authors: Klemms
ConveyorBelts::Combined Totalcount(149958) total(11.49% 92.464s, 36.50% of tick)avg(0.62ms per - 18.25ms/29.60 per tick)
ConveyorBelts::Task: fr.klemms.conveyorbelts.ConveyorBelts$1 (interval:3)count(1689) total(11.48% 92.378s, 36.46% of tick)avg(54.69ms per - 18.23ms/0.33 per tick)
ConveyorBelts::Event: f.k.c.Events (PlayerMoveEvent)count(148269) total(0.01% 0.086s, 0.03% of tick)avg(0.00ms per - 0.02ms/29.26 per tick)

QuickShop (v4.0.7.6)
Authors: PotatoCraft Studio, Netherfoam, Timtower, KaiNoMood, Ghost_chu, Mgazul, TiaraRinne, sandtechnology
Economy Shops plugin
QuickShop::Combined Totalcount(324726) total(1.04% 8.359s, 3.30% of tick)avg(0.03ms per - 1.65ms/64.09 per tick)

This is my current top two plugins and their usage, quickshop in second place with a 3.30% of tick and in first place conveyorbelts with 36.46 of tick.

So in conclusion, use this plugin if you are only playing with friends and don't care about tps drops, and don't use it on a production server.