I still have furnaces left over from the time I tried locking off part of my island. Apparently all the signs cause lag, so I had to demolish it halfway through. Ill sell you the furnaces if you like though.
I'll sell ya a SC of furnaces if you'd like...For 3 - 4 diamonds maybe? I don't think it's legal to protect a super large area with signs though...
Magik, it lags the server. Just like how it's illegal to have 'too many' mobs on your island, I believe that too many signs aren't really favourable either.
I forgot about that. Signs do lag if too many. If the signs become too laggy then you'll have to remove them.
Remove everyone's donor walls, locked items, and equivalents first. Same thing right? Just, in this case, a confined area. Which if I'm right, does no more than anything else placed. As signs are no more than just a "block". They are technically considered entities, but not entirely. I've done experiments with signs and have found little to no changes that any ordinary blocks would have done.
The text is only rendered when looked at directly, ergo if you are not outside of where they would be placed, as well as directly looking at them, as well as in the render distance.. There would be nothing different.
I've been on an island with a huge amount of signs in one place on net. There was probably hundreds of signs. It had a lot of lag in that area. Though after rethinking it I don't think it affects the whole server, just the nearby area.
Maybe for you there was lag. But for my testings (on my island alone), I had over 1000 lockettes within a 100x100 radius, and it had no effect on me. Or any complaints on the server, or drops in TPS in /lag.
I can't remember which, but I recall a mod stating that it was strictly illegal like the mass spawning of mobs.