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The Attack Speed Upgrade increases your cannon fire rate. 


Tools | Fishing RodSpyglass
Weapons | Cannon
Basic Upgrades | Distance UpgradeAttack Speed UpgradeDamage UpgradeShip Speed Upgrade
Ship Upgrades | Air PeglegNitro PegReinforced PlanksSteel Reinforced PlanksAdvanced Toolkit
Cannon Upgrades | Steel BarrelSinker's GlovesBlue GunpowderTitanium Barrel
Hybrid Upgrades | BruiserDrifterDemolisher
Other | Fountain of Youth