I'm working currently on an exact calculation of RC costs for the beem library. I will write an Utopian post about the new features when Utopian has recovered.
The script is creating a signed operation and calculates the exact RC costs that would have been charged when broadcasting the operation. As the calculation is accurate, we can see the smallest changes.
I calculated the RC costs 600x for
* my last post
* a transfer: {"from": "holger80", "to": "beembot", "amount": Amount("0.001 STEEM"), "memo": "Test"}
* a vote: {"voter": "timcliff", "author": "holger80", "permlink": "rc-costs-do-not-depend-on-compute-time", "weight": 10000}
First results
RC costs for a post
RC costs for a transfer
RC costs for a vote
Conclusion
All RC costs are going down right now. But the RC costs for a post/comment are almost constant.
I will continue to work on the new rc module for beem.