*PLEASE READ* Bukkit Stuttering Issues!

Hello!
My server gets around 120 online, my tps is usualy 20 tps, but my ram recently has been realy low, since the 1.3 update my rams @ 7% free usualy!
also every 10 seconds my server has a freeze up, like player movements/block breaking freeses for 5 secoonds then resumes, but chunks still load during this time!!!

06.08 11:48:19 [Server] INFO Plugins (42): LagMeter, HideStream, nChat, GroupManager, NoCheatPlus, WorldEdit, FastSoup, SilkierTouch, Buycraft, SpamGuard, Vault, AntiRelog, WorldGuard, SignColours, iConomy, boosCooldown, CraftBay, WorldSaver, Permissions, LimitedCreative, SkylandsPlus, AntiCaps, RealWinter, BKCommonLib, ZavAutoMessager, PluginSpy, My Worlds, Tracking-Plugin, NoCheat, Votifier, MCCMonsterFix, Infected, MoneyDrop, FoundDiamonds, Essentials, EssentialsProtect, EssentialsSpawn, Assassins, NoLagg, ChestShop, EssentialsChat, Factions