I must have downloaded the image before the update. When I look at the debug log I'm not getting anything more than the normal MIG activity (program activity, module status change, etc). I did not see any X10 debug messages like you are showing in the attached image.
I did some testing and it looks like the HG interface runs much faster in regards to my little test C#. The time for HG to process a command was up to 1 second before (time between when switch status changed and the light status changed). When I ran r367 last night, the delta time was as little as 0.001 seconds though I did see at least one time where it was 0.3 seconds so it must depend on other things going on within HG at the time. This represents the time between HG seeing an X10 command and when HG sends out the response. Ideally, this would be 0.0 seconds, but 0.001s is probably close enough
I did notice that it was not possible to set up any advanced features on any of my modules. When I selected "Add module" and selected the X10 address the only options are name, type, and energy usage. I'll update to r367(new) tonight to see if this was just a fluke.