How to make this script be more responsive?

Code Information

I have a script that has a Touched event. The variable, speedPad, is listening to the touched event. I used an array called touchedSpeedPad to store all the character's names that have touched the speedPad. This made the SpeedPad more responsive, however, this doesn't prevent the lag occurring. Is there any way to hide and/or stop this lag from happening to the players.

Some Other Important Stuff

Please don't say to do debounce because debounce makes the players go one by one!

Also, please don't say to use Part:GetTouchingParts() because the character's parts are CanCollide false

People also say that I should handle this code on the client side. I don't think this is a good idea, however, I probably might be wrong. Should I listen to them?

Edit: Plus, the character's parts have no TouchInterest in them

Code

local speedPad = script.Parent
local duration = jumpPad:WaitForChild("Duration")
local speed = jumpPad:WaitForChild("Speed")

local touchedSpeedPad = {}

local function onTouched(hit)
    local humanoid = hit.Parent:FindFirstChild("Humanoid")
    if humanoid then
        local char = hit.Parent 
        if touchedSpeedPad[char.Name] then return end       

        touchedSpeedPad[char.Name] = true       
        humanoid.WalkSpeed = speed.Value

        wait(duration.Value)
        humanoid.WalkSpeed = 20
        touchedJumpPad[char.Name] = nil
    end
end

jumpPad.Touched:Connect(onTouched)