speed
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speed
A colloquial term borrowed from English for the drug amphetamine, which has an energizing and stimulating effect.
Er stand unter dem Einfluss von Speed und konnte die ganze Nacht nicht schlafen.
He was under the influence of speed and couldn't sleep all night.
'Speed' is a loanword from English and is used in German mainly colloquially or in certain scenes, such as youth language or gaming.
Die Jungs reden nur noch über Autos und wie viel Speed sie haben.
The guys only talk about cars now and how much speed they have.
The context tells you whether the drug or speed in the sense of velocity is meant. If it is about drug use, parties, or crime, it means the drug. If it is about technology, cars, or games, it means velocity or performance.
Die Polizei fand bei der Kontrolle eine kleine Menge Speed.
The police found a small amount of speed during the check.
In connection with the drug, certain verbs are typical. Common phrases are 'Speed nehmen' (to take/use speed) or 'auf Speed sein' (to be on speed, under the influence of the drug).
Er hat zugegeben, regelmäßig Speed zu nehmen.
He admitted to regularly taking speed.
speed
'die Geschwindigkeit' and 'die Speed' can both mean speed. 'Geschwindigkeit' is the normal and neutral word and fits in almost all situations, including school, traffic, technology, or official texts. 'Speed' is colloquial and sounds more modern or typical of certain scenes, for example in gaming, sports, or casual conversations. Learners should be careful because 'Speed' can also mean a drug; in this relation, however, it is about speed. If you want to speak safely and neutrally, use 'Geschwindigkeit'.
Im Spiel fehlt dem Auto die Speed auf der langen Strecke.
In the game, the car lacks speed on the long stretch.
Finn misst im Physikunterricht die Geschwindigkeit eines kleinen Wagens.
In physics class, Finn measures the speed of a small cart.