" apace "

[Adverb]  | "apace" | \ ə-ˈpās \

1: at a quick pace : swiftly

2: abreast —used with of or with

Origin: 14th century ;

 Middle English, probably from Middle French à pas on step;

[Idiom]  | "apace with" 

1: going or advancing at the same rate as (something)

[Idiom]  | "keep/stay apace with" 

1: to go or advance at the same rate as (something) : to keep up with

[Idiom]  | "at a snail's pace" 

1: very slowly

[Adverb]  | "apace"