Andrew Shadoura has been having some problems with unexplained pauses in 
processing.
While this might be due to DNS or rDNS, it still could be useful to have 
some fine-grained timing information.
I've added some support for uS-grain timestamping of various phases of 
request processing.  It can be turned on/off with Debug on stamp 1 / 
Debug off stamp 0 in your local.tcl - this will also produce stderr 
output detailing the processing time of each request.
I've also added a new Domain called 'Server' which will accumulate this 
data, and present it as HTML or CSV for analysis.
To quote the Domains/Server/Server.tcl source:
# add the following to site.config to install this:
# /server {
#    domain Server
#    url /server
# }
Furthermore, there's a new Http command to add a timestamp to the 
request dict, so it can be accumulated and displayed as above:  set r 
[Http timestamp $r tag] ... where 'tag' is whatever tag you want to 
associate with the timestamp.  This way, if you want more detail about 
the processing within a domain, it can be easily added (should help zero 
in on performance bottlenecks.)
This is all in SVN now, and seems to work ok.
Colin.