This is the 10988th most frequent Swedish word.
långsamma
Slow.
Here, 'långsamma' describes the adjective 'slow' referring to 'bilarna (the cars)', indicating the action of being slow.
De långsamma bilarna blockerar vägen.
The slow cars are blocking the road.
In this sentence, 'långsamma' characterizes 'internetanslutningar (internet connections)', emphasizing that they function slowly.
Jag har långsamma internetanslutningar hemma.
I have slow internet connections at home.
This usage shows 'långsam', the singular form, applied to describe a person 'han (he)', indicating deliberate careful activity.