an obligation to provide consideration
https://www.google.pl/search?sxsrf=ACYBGNQk-YiBN8SI4maYsZ0L5...

an obligation/a duty to render (a) performance
https://www.google.pl/search?sxsrf=ACYBGNR0cdWA62d0ktMjZaLd0...

https://legalenglishexpert.pl/slownik/swiadczenie/

(22) "Course of performance" means repeated performances, under a contract that involves repeated occasions for performance, which are accepted or acquiesced in without objection by a party having knowledge of the nature of the performance and an opportunity to object to it.
https://law.lis.virginia.gov/vacode/title59.1/chapter43/sect...

§ 59.1-507.9. Anticipatory repudiation.

(a) If a party to a contract repudiates a performance not yet due and the loss of performance will substantially impair the value of the contract to the other party, the aggrieved party may:

(1) await performance by the repudiating party for a commercially reasonable time or resort to any remedy for breach of contract, even if it has urged the repudiating party to retract the repudiation or has notified the repudiating party that it would await its performance; and

(2) in either case, suspend its own performance or proceed in accordance with § 59.1-508.12 or § 59.1-508.13, as applicable.

(b) Repudiation includes language that one party will not or cannot make a performance still due under the contract or voluntary, affirmative conduct that reasonably appears to the other party to make a future performance impossible.
https://law.lis.virginia.gov/vacode/title59.1/chapter43/sect...

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Note added at 6 hrs (2019-10-19 17:29:56 GMT)
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obligation to render performance
https://www.google.pl/search?sxsrf=ACYBGNTmMJ7KQo8cajxsP_d0n...

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Note added at 6 hrs (2019-10-19 17:43:25 GMT)
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Consideration is the benefit that each party receives, or expects to receive, when entering into a contract. Consideration is often monetary, but it can be a promise to perform a specific act, or a promise to refrain from doing something. In order for a contract or agreement to be legally binding, every party to the contract must receive some type of consideration. In other words, a contract is a two-way street, so each party must receive something of value from the other party or parties. Illegal or immoral acts are not legally considered to serve as consideration.
https://legaldictionary.net/consideration/

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Note added at 6 hrs (2019-10-19 17:46:52 GMT)
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https://www.google.pl/search?sxsrf=ACYBGNRekT17r1GwRzljYKQ9F...

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Note added at 1 day 20 hrs (2019-10-21 07:04:38 GMT)
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W tłumaczeniu KC wydanym przez Becka i jeszcze jednym użyto "performance" na świadczenie, a "obligation" na zobowiązanie.