https://www.musical-u.com/learn/musicality-means-having-good-rhythm/
What does it mean to have good rhythm? Part of good rhythm is playing the rhythm in time, which means that the musician doesn’t rush or drag the tempo.
A person with good musicianship can play any rhythm pattern by ear or through sight-reading in tempo without speeding up or slowing the tempo. https://www.musical-u.com/learn/musicality-means-having-good-rhythm/