Terribly bad code, finds resource hole?

[Pantho]

Z Code:
[LUA]
BuddyList = BuddyList or {}
function TheMenu( Panel )
Panel:ClearControls()
Panel:Clear()
Panel:AddControl("Label", {Text = "\nSuper duper basic buddy list:\nClick to obtain a friend!"})
local BList = vgui.Create("DListView")
BList:SetParent(Panel)
BList:SetPos(10, 100)
BList:SetSize(300, 275)
BList:SetText("Buddies:")
BList:AddColumn("No"):SetFixedWidth(25)
BList:AddColumn("Online Players")
if (BuddyList) then
for k,bud in pairs(player.GetAll()) do
BList:AddLine(k,bud)
end
end
function BList:OnClickLine(line)
AddBuddy(line:GetValue(2))
TheMenu(Panel)
end
local BList2 = vgui.Create("DListView")
BList2:SetParent(Panel)
BList2:SetPos(10, 380)
BList2:SetSize(300, 275)
BList2:AddColumn("No"):SetFixedWidth(25)
BList2:AddColumn("Double click to remove")
if (BuddyList) then
for k,bud in pairs(BuddyList) do
if IsValid(bud) then
BList2:AddLine(k,bud)
end
end
end
function BList2:OnClickLine(line)
RemoveBuddy(line:GetValue(2))
TheMenu(Panel)
end
timer.Create("Panel refresh",5,0, function()
if (FPPBuddyList) then
for k,v in pairs(FPPBuddyList) do
for _,ply in pairs(player.GetAll()) do
if ply:SteamID() == v then
AddBuddy(ply)
end
end
end
end
TheMenu(Panel)
end)
end

function createthemenu()
spawnmenu.AddToolMenuOption( "Options",
"ByB",
"CustomMenu",
"Prop Buddies", "", "",
TheMenu,
{})
end
hook.Add( "PopulateToolMenu", "pleasework", createthemenu )
[/LUA]

So this is an option inside the Q menu, but I'm curious about something. I know it's just plainly stupid code, it was made while I was learning some stuff a year or so ago.
The code in itself is creating a timer, that makes itself run every 5 seconds and creates the timer again. Pure idiocy I agree, however.

Why does this cause an escalation in memory and CPU usage whenever the client opens the Q menu? The timer should be recreating itself, not causing major memory leaks and escalating CPU usage.

Also:
While this threads up, I'm obviously remaking the above part of the Q menu edits. But how do I repopulate the list for stored new players without having to redraw the entire panel each time? When I add entries to the list (BLIST) for example it simply doesn't show unless I redraw the entire thing.

[editline]8th October 2013[/editline]

The temporary capture breaks post editing:

It's not a direct CPU spike I always see, however performance when the Q menu open drops to 4fps etc.

[Netheous]

@Edit:
Just noticed you aren't talking about the thing I thought.
Sorry.