When Gmail first came out I was amazed at how fast it was, so much faster than the native outlook client I used at the time, wow! How is that even possible in javascript!

Now gmail is slower than most any other website I use regularly. Can't even refresh the inbox in less than three seconds.

I've noticed the same slower by a bit every year pattern with google maps too. I'm afraid to click anything when I have a map open because I know it might trigger a repaint which will cause me to sigh and switch to another tab while it chugs for a few seconds to accomplish this.