Open the withdrawal page before the deposit page. What a cashier says about its own minimum, fee, ceiling and expected window - and where it says it - is the single most informative thing on any casino site.
Record the bonus terms that decide eligibility rather than the headline percentage: the wagering multiple, the max-cashout clause, the game weighting and the max bet.
Check whether approval runs at weekends, because on a payout page that is the difference between a stated one-day process and a five-day wait.
Note what is missing. A cashier that will not state a ceiling, or scatters its fee schedule across a help centre, is telling you something and it counts against it.
Never publish a per-brand payout time as a specification. One timed withdrawal from one account on one day is an anecdote, not a measurement.