`WOW_UI_HANDLERS` names the handler and `WOW_UI_TICK` names the tick phase, and
between them they left the question this answers. A reload of the player's
interface spends **4.47 s inside handler bodies**, and single calls in there cost
hundreds of milliseconds — `pfBag:OnHide` 394 ms in ONE call — which is not Lua
arithmetic. A handler's self time includes the engine work it provokes, so that
time is ours: it is inside the verbs the handler called, and nothing charged it to
them.
`WOW_UI_VERBS=1` wraps every global and every widget method at the end of
`UiScript::new` — before FrameXML or any addon runs, so everything it finds is
ours — and times each call. Off, nothing is wrapped and nothing is paid.
It works offline, which matters more than the live case: the addon harness's
`--together` mode loads the player's whole folder into one VM in load order, which
is the closest thing to a login burst that needs no server. The first run over his
91 addons, three passes:
```
[ui-verbs] 519 verbs, 17,966,414 calls, 9,148 ms in all
4384 6393 685.8 us pcall (addon code, nested)
1498 16071556 0.1 us type (5.4M calls a load, Ace's)
1241 1950 636.2 us frame:GetWidth ← 650 calls a load at 0.6 ms each
548 33093 16.6 us CreateFrame
219 37524 5.8 us fontstring:SetPoint
95 99 960.3 us frame:GetHeight
67 123 545.9 us frame:GetLeft
17 3 5628.6 us frame:GetCenter
```
A geometry read costing 636 µs is the whole finding, and the fix is the next
commit.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SgstFWtn1RxEJ5kVrpgYwn
gromandClaude Opus 5
c5911ccd6f