speed
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speed
The quality of having a high speed or of doing, moving, or understanding something in a short time.
Die Schnelligkeit des Geparden bei der Jagd ist beeindruckend.
The speed of the cheetah when hunting is impressive.
The word is derived from the adjective 'schnell' (fast). The ending '-igkeit' is a typical way to form abstract nouns from adjectives that describe a quality or state.
Die Genauigkeit ist bei dieser Arbeit wichtiger als die Schnelligkeit.
Accuracy is more important than speed in this work.
To express whose speed is meant, the genitive is often used. Alternatively, you can also use a preposition like 'von' (of/from) or 'bei' (in/when).
Die Schnelligkeit des neuen Prozessors ist beeindruckend.
The speed of the new processor is impressive.
Common adjectives are 'hohe' (high), 'enorme' (enormous), or 'beeindruckende' (impressive) with 'Schnelligkeit' (speed). Typical verbs are 'an Schnelligkeit gewinnen' (to gain speed) or 'die Schnelligkeit erhöhen' (to increase the speed).
Das Internet hier hat eine sehr hohe Schnelligkeit.
The internet here has a very high speed.
speed
'die Geschwindigkeit' and 'die Schnelligkeit' are close in meaning because both say that something is fast or happens quickly. 'Geschwindigkeit' is often the measurable value or the speed of a vehicle, a movement, or a process. 'Schnelligkeit' is more about the quality or ability to be fast, for example in a person, a reaction, or a piece of work. The words can be confused because both are connected to 'schnell' (fast). If you mean a specific movement or number, 'Geschwindigkeit' fits better. If you are describing an ability or quality, 'Schnelligkeit' is more natural.
Ihre Schnelligkeit hilft der Ärztin, in Notfällen ruhig und richtig zu handeln.
Her speed helps the doctor act calmly and correctly in emergencies.
Bei der Arbeit misst das Programm die Geschwindigkeit der Internetverbindung.
At work, the program measures the speed of the internet connection.