(as) slow as molasses
US /əz sloʊ əz məˈlæsɪz/
UK /əz sloʊ əz məˈlæsɪz/
1.
extremely slow; moving or happening at a very low speed
:
•
The old computer runs as slow as molasses.
•
Traffic was moving as slow as molasses on the highway.
extremely slow; moving or happening at a very low speed