(as) slow as molasses
US /əz sloʊ əz məˈlæsɪz/
UK /əz sloʊ əz məˈlæsɪz/

1.
chậm như rùa, rất chậm
extremely slow; moving or happening at a very low speed
:
•
The old computer runs as slow as molasses.
Chiếc máy tính cũ chạy chậm như rùa.
•
Traffic was moving as slow as molasses on the highway.
Giao thông trên đường cao tốc di chuyển chậm như rùa.