Very lag in some place

My server suddenly became lag yesterday.
And I find out when I enter a place near respawn point,I get very low fps and then error.
I think that place is the cause,but it's useless whether I remove all plugins or replace the place with other blocks.
Please help!

here is the video:
http://www.youtube.com/watch?v=jNrPRyf7srs&list=UUnJqw9TLO4YAxjrg9599Ktw&index=1&feature=plcp

 

Strange, is there a huge amount of entities spawned or dropped at the spawn? like a lot of items or mobs wandering around?
zip

 

Try /stoplag from WorldGuard to see if it's related to either redstone, waterflow or entities. Also try WorldEdit's //remove drops 100 to remove all drops if they are the issue.

 

Be aware that /stoplag will cause many things to stop, such as waterflow, redstone, fire, tnt,...

 

Yeah, but it stops when you restart

 

I know =) but I just wanted to point out so that a user know what happens when using a command =) it was a good idea btw =) would have never thought of it myself, hope it works =)
zip