Zero tick farms?

We were making a lot of farms lately and it started to affect server performance.

So I’ve got a quick question which I found no answer to while googling. How does a zero tick farm effects the performance of a regular Minecraft server. And more importantly, are the common zero tick farms (sugar cane for example) better for the server performance than a “normal” sugar cane farm with hundreds of pistons, observers, redstone and water item streams?

AFAIK, zero tick farms only decrease the fps on the client side, but not the tps of the server. Unlike, normal farms, which can create huge lag spikes everytime they fire.