When placing down too many signs with text on them, it causes a lot of lag, like in Stampy's Love Garden.
Reproduction Steps:
1: Place many signs with text on them
2: See error
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This happens because the game has to remember the text that is on the signs, and this may cause lag

Would it be possible for you to attach an example world that can be used to reproduce this?

I could confirm possible, I tested with a lot's of written signs in flat world
Here is a world file for testing the fps drops:
[media]