iConomy and Essentials lagging my server?

Hi, I'm running a fairly new Minecraft server with 1.5GB RAM. However, whenever I use iConomy, mcMMO commands or specific Essentials commands (i.e /broadcast) or if someone dies, the server lags for a few seconds. Here are my plugins:
Referrals, WorldEdit, NoCheatPlus, Towny, Buycraft, PermissionsBukkit, LogBlock, Questioner, WorldGuard, LazyRoad, iConomy, ClearLag, AutoSaveWorld, Votifier, McMMO, FixFirstSpawn, Essentials, SimpleVoteListener, Vault, RealJobs, LWC, CommandShops

My host says more RAM won't help.
Thanks guys

edit: just got killermoney, which gives money when you kill something.. it lags whenever someone kills something now

 

Well first off, if you have essentials, you dont need iConomy, essentials has its own economy feature. (Dont worry, since you have vault deleting iConomy wont do any harm)

Also, try updating vault, all three of those plugins you mentioned use vault.

 

I just got Vault today. And okay, thanks for the iConomy tip.

Removing iConomy fixed it. Thanks.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.