I consistently earn 50k+ Credits per 10-20 minutes with this script. I've also tested it in many other conditions yielding the same general result.
This script is 100% silent and works without much visual feedback. Before dming me, please wait up to 30 minutes; if you have received less than 50k credits, something is wrong. Not teleporting into the play zone is intended. This script has only been tested with Synapse.
Demonstration: https://www.youtube.com/watch?v=DoY9stqUJgI&t (Anti-Idle is now built-in)