Does sass harm performance?

I've been educating myself. Reading this:

The engine evaluates each rule from right to left, starting from the rightmost selector (called the "key") and moving through each selector until it finds a match or discards the rule. (The "selector" is the document element to which the rule should apply.)

For example:

ul li a {...}
#footer h3 {...}
* html #atticPromo ul li a {...]

Now, some example code SASS outputs for me:

#content #blog {
  /* ... */
}
/* line 85, ../sass/screen.scss */
#content #flickr {
  /* ... */
}

#content #flickr div p {
  /* ... */
}

This seems a bit awkward.. am I doing something wrong? Is this a communication problem between me and Sass? Are we losing it?

Edit: Some SCSS code:

#flickr {
    @include columns(5,8);
    background: url('../img/ipadbg.png') no-repeat;

    #ipod-gloss {
        z-index: 999;
        position: relative;
    }

    div {
        margin-top: -80px;
        margin-right: 20px;

        h2 {
            color: $white;
            font-size: 24px;
        }

        p {
            margin-top: 40px;
        }
    }
}

Side Bonus!: The article says browsers (or at least Firefox) search the selectors from right to left. I couldn't understand why this is a more efficient why. Any clues?