Andrew, as part of a test setup, I have 1 rule active and 1 PC attached to the BWM as a test client. The rule has a rate limit of 8000000:250000 bps (8MBPS:250Kbps) through a Quota. I am testing using file downloads of various types HTTP, FTP etc.
When I don't check the 'Combined' button, BWM limits pretty well and I get nearly the expected 8Mbps download speed. Upload is minimal. However if I check the 'Combined' button, the download speed drops to about half. Given the upload is around 100kbps, I expected to to drop to about 7.5MBPS based on my reading of the manual.
Regardless of what throughput I select, I get an actual download speed which is about half of what I set. (no penalties) I can see that it is being limited.
Can you please explain the combined function or this behaviour a little for me?