At a snail’s pace
Definition 1 of 1
Pro Tip 1/3Visual Imagery
Imagine a snail moving to understand how slow the pace is in real-life situations. 
When in traffic, we were going at a snail's pace.
Pro Tip 2/3Negative Connotation
'At a snail’s pace' often implies frustration or impatience with the slow progress. 
I'm tired of this Internet connection; it's loading at a snail's pace!
Pro Tip 3/3Informal Context
This phrase is typically used in casual or informal contexts, not in formal writing. 
The checkout line was moving at a snail's pace.