The other thread needs you to dig around before you can actually find the information about extensions, which should now be enabled by default.
The performance, for comparisons sake, is about the same as default and still miles faster than Firefox.
Here is my current setup.
Current extensions I have running are:
Adthwart - like Ad-block but currently seems more mature than Ad-block on Chrome
OneNumber - allows me to check Gmail, Google Wave, Google Reader and, when I get it, Google voice. Love having just ONE icon instead of multiple ones
ForecastFox - Weather. Mouse over gives a little more detail, click shows entire forecast and radar while never navigating away from the screen. Seems a far better interface than on Firefox. The temperature updates much faster than my desk-top rainmeter application, hence the difference in temps
Smoothscroll - Chrome was not as herky/jerky as FF, but still needed a little help. Smoothscroll with my free-spin mouse is a fantastic little extension
Speeddial - Pictured. Fantastic app as it extends my home-page and now I can have a lot more sites listed as well as allowing a custom backgroun (I went with a snowy scene)