I guess by now we are all on the same page when it comes to temperatrue.
What about a change in QNH? In the past manuals there was a flow chart like the one posted by Vilas in #36 under the Performance chapter that say up to 2 hpa drop there's no need to recalculate our performance but that has since been removed since the introduction of Flysmart.
In theory, any reduction in pressure reduces aircraft performance so we recalculate for any pressure drop. Is that what everyone out there is doing?