Before you start yelling OMG FASTER WHO CARES??? you might want to read the fine article:

"""
WHY A NEW DEBUGGER?

In order to achieve our goals we decided to start with a fresh architecture that would support modern multi-threaded programs, handle debugging symbols in an efficient manner, use compiler based code knowledge and have plug-in support for functionality and extensions. Additionally we want the debugger capabilities to be available to other analysis tools, be they scripts or compiled programs, without requiring them to be GPL.
"""

This is about better code analysis and integration, not faster debugging.

The biggest difference that I've noticed btw. Chrome and Safari is about 1GB free memory when using Chrome. No exaggeration. Safari has gotten INSANELY bloated. I've been using a Chromium nightly for about two weeks and it's like night and day. Safari is beach-balls galore, while Chromium (and now Chrome) is just speedy and compact.

I quit a Safari session I was running this morning with TWO TABS and it freed 750MB. That is so wrong.