system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] What is the difference between the Speedforce and the Negative Speedforce?

I've heard that the Negative Speedforce is a parasitic entity, but what exactly is it/does it do differently from the Speedforce?
gpt
Mostly, it acts same for Eobarde Thawne as the Speed Force does for regular speedsters (the Flashes, Jesse and Johnny Quick, Max Mercury).

Something about the Negative Speed Force basically *subtracts* from the Speed Force (as the name implies), causing pain to speedsters that try to use their powers. The only exception being Barry Allen, who generates the Speed Force and was able to counteract the effects the Negative Speed Force causes.