Vaccination is proceeding at a CHELONIAN pace

What's the word I'm thinking of? Today, it's.... 

CHELONIAN [che-LO-nee-UN] (noun or adjective)

A turtle or like a turtle or tortoise (i.e., slow)

"Weighed down by bickering and blather, the farm bill crept through Congress at a chelonian pace."
--Valerie Strauss, The Washington Post (2013)