Slow-running is a term commonly used when describing things or processes that move at a slower pace than expected. However, there are plenty of synonyms that can be used to describe the same idea but with more imaginative nuance. Some options include sluggish, plodding, lethargic, sluggish, or creeping. Alternatively, you could use snail-like, slothful, dilatory, or languid. Other options that evoke a sense of gradualness and unhurriedness include relaxed, measured, deliberate, or steady. By exploring different options for describing a slow-running situation, you can add depth and specificity to your language and better convey the tone and feeling of what you are describing.