RTC Proxy v RTC Disctributed SCM

Does anyone have a table comparing the relative benefits of using an RTC proxy server compared with using distributed SCM?

I'd like to understand which ones could benefit the following in particular:

* time taken to download code to your workspace
* time taken to to run a development build
* time taken to check-out/in files
* time taken to display dashboards

Thanks in advance,
John.

John - Was this answered off line of not at all yet?