How to break out of while true loop when getting a remote function fire?

EDIT : Some of my scripts have worked on this, but they were too laggy (0.1 fps) Okay, i was making a game where there's a timer and leaderboard , with a start / end point This is my local script, parent of the timer gui

--a = 0
local RS = game:GetService('RunService')
--RS:BindToRenderStep('',1,function()
	--a = a + 1
	--b = a / 60
	--script.Parent.Text = b


--end)

game.ReplicatedStorage.RemoteEvent.OnClientEvent:Connect(function(a)
	local starttime = workspace.DistributedGameTime
while true do
	wait()
    local time = workspace.DistributedGameTime - starttime
	script.Parent.Text = time
end
local seconds = script.Parent.Parent.Time

script.Parent.Text = seconds.Value

game.ReplicatedStorage.End.OnClientEvent:Connect(function(a)
	local starttime = workspace.DistributedGameTime
	tim = time
	game.ReplicatedStorage.Submit:FireServer(plr, starttime, workspace.DistributedGameTime, tim)
end
)end)

This is my start brick script, parented to a part

function deathTouch(part)
game:GetService("Players") 
local plr = game.Players:GetPlayerFromCharacter(part.Parent)
plr.Character.Humanoid.WalkSpeed = 0
plr.PlayerGui.ScreenGui.TextLabel.Text = "0"
wait(0.1)
plr.Character:MoveTo(Vector3.new(0,0,0))
wait(0.1)
plr.Character:MoveTo(Vector3.new(0,0,0))
wait (0.8)
game.ReplicatedStorage.RemoteEvent:FireClient(plr)
plr.Character.Humanoid.WalkSpeed = 16
end
script.Parent.Touched:connect(deathTouch)

This is my end part, when you touch it the timer ends

function deathTouch(part)
game:GetService("Players") 
local plr = game.Players:GetPlayerFromCharacter(part.Parent)
game.ReplicatedStorage.End:FireClient(plr)
end
script.Parent.Touched:connect(deathTouch)

This is my script in server script service

game.ReplicatedStorage.Submit.OnServerEvent:Connect(function(plr, submittime, endtime, tim)
	print(plr .. submittime .. endtime .. tim)
end)

Remote Events Used : Submit, RemoteEvent, End

Main problem So the problem is the starting brick works, but when I touch the end brick the timer is still stuck in the timer while loop state, i've tried many solutions, any help? (dont ask whats the error there is none) Other problems The timer is slightly inaccurate, i've tried using run service but I am a noob at that and didn't use it Why was this created? A map with a leaderboard and players with the fastest times will be put on leaderboard

Create a variable which turns to true when whatever is clicked, and make the while true do instead reference if the variable is false instead of looking for true.