Lag when holding mouse button in specific area

[RaidSoft]

Title: Lag when holding mouse button in specific area

Version: 3.1.2

OS: Windows 7 Ultimate (64-Bit)

Java Version: 7.0.50.6

Description of Problem:

When I hold down either my left or right mouse button in a specific area around where my house is I get tiny lag spikes, if I move away just a little bit (not far enough that the area unloads, maybe 3 chunks away) the lag effect stops happening.

Debug screen showing the issue: https://dl.dropbox.com/u/56180/mclag2.png that is when I am holding my left mouse button down (note that it doesn't matter if I am punching air or an object) and here is how it looks without holding any mouse buttons: https://dl.dropbox.com/u/56180/mclag1.png

I tried this with a friend too and he has exactly the same thing in the same area and no issues just a chunk or two away. This is obviously no gamebreaking bug but it is frustrating as hell, the area is not even super heavy on how much is built there. (Sorry if I'm posting this in the wrong place, ignore/delete if I am)

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