A test to see what method is the fastest

HitboxTest.lua

-- OverHash method: https://devforum.roblox.com/t/detecting-on-which-map-the-character-is/233463/13?u=overhash
-- Aznarog method: https://devforum.roblox.com/t/what-is-the-quickest-and-most-efficient-way-to-check-if-a-player-is-within-a-region/367554/5?u=overhash
-- EDmaster24 method: https://devforum.roblox.com/t/what-is-the-quickest-and-most-efficient-way-to-check-if-a-player-is-within-a-region/367554/3?u=overhash
-- ForeverHD method: https://devforum.roblox.com/t/zonecontroller-retrieving-players-within-an-area-zone/397465
local Functions = { }

local hitbox, part = workspace.Model.MAIN, workspace.Model.example

Functions["OverHash method"] = function()
    local LocalDifference = (hitbox.CFrame - hitbox.CFrame.p):inverse() * (part.Position - hitbox.Position)

    local inRegion = ((math.abs(LocalDifference.X) < hitbox.Size.X/2) and (math.abs(LocalDifference.Z) < hitbox.Size.Z/2))
end

Functions["Aznarog method"] = function()
    local size = part.Size
    local partCFrame = part.CFrame
    
    local max = partCFrame.p + (0.5 * size)
    local min = partCFrame.p - (0.5 * size)
    local region = Region3.new(min, max)
    
    local relativePosition = (hitbox.Position - region.CFrame.p) / region.Size
    
    local inRegion = not(-0.5 <= relativePosition.X and relativePosition.X <= 0.5
        and -0.5 <= relativePosition.Y and relativePosition.Y <= 0.5
        and -0.5 <= relativePosition.Z and relativePosition.Z <= 0.5)
end

local zone = require(script.Parent.ZoneController).new(part, 10, false)
Functions['ForeverHD'] = function()
	local inRegion = zone:getPlayer(hitbox)
end

local RotatedRegion3 = require(script.Parent.RotatedRegion3)
Functions['EDmaster24 method'] = function()
    local region = RotatedRegion3.fromPart(hitbox)
    
    local inRegion = region:castPart(part)
end


wait(5)

for i = 1, 5 do
    require(2110831719).new(2, "Region3 vs math", Functions)
    wait(3)
end