to deliver / to perform
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to deliver
To bring something that you have transported, produced, or completed to its destination and hand it over there.
Der Paketbote hat das Päckchen bei den Nachbarn abgeliefert.
The parcel carrier delivered the package to the neighbors.
'Abliefern' (to deliver / to perform) is a separable verb. In a main clause, the prefix 'ab' goes at the end. In subordinate clauses or in the infinitive with 'zu', the verb stays together.
Der Lieferdienst liefert die Pizza in 30 Minuten ab.
The delivery service delivers the pizza in 30 minutes.
The meaning depends strongly on the context. If it is about a concrete object (package, report), it means 'to hand over'. If it is about performance (in sports, at work), it is informal for 'to deliver a top performance'.
Die bestellte Ware wurde direkt im Büro abgeliefert.
The ordered goods were delivered directly to the office.
When naming the recipient or the place of handover, you usually use the preposition 'bei' with the dative. The structure is: [etwas] bei [jemandem/Ort] abliefern ([something] deliver to/at [someone/place]).
Du kannst die Unterlagen einfach bei meiner Kollegin im Empfang abliefern.
You can simply deliver the documents to my colleague at reception.
The meaning 'to put in an impressive performance' belongs to informal colloquial language. In a formal text, for example an official evaluation, you would not use this word.
Unser Team hat im entscheidenden Spiel einfach abgeliefert.
Our team simply performed in the decisive game.
to perform / afford
'leisten' and 'abliefern' can both mean that someone puts in a good or expected performance. 'leisten' is more neutral and more general. It fits with work, effort, help, or a result. In this meaning, 'abliefern' is more informal and often sounds connected to sports, the stage, exams, or a high-pressure situation. You say it when someone has to show what they can do. The words can be confused because both focus on a result. 'leisten' sounds more objective, while 'abliefern' emphasizes the moment and the impact more strongly.
Im Finale hat die junge Spielerin richtig abgeliefert.
In the final, the young player really delivered.
Ihr müsst heute viel leisten, weil der Bericht morgen fertig sein soll.
You have to get a lot done today because the report needs to be finished tomorrow.