As our blogs grow and get more traffic, more “fun” things tend to get added on. We add a sidebar image here, a tracking script there, Adsense on top and below, etc. All these things eventually start becoming too much, and slows down your blog- especially when we start forgetting to delete old and outdated plugins as time goes on.
I don’t have to tell you this, but a slow loading blog makes for a poor user experience – and you do not want to lose those visitors you worked so hard for. Keep in mind that visitors subjected to poor site performance rarely complain – they just leave and don’t come back. Nobody is going to take the trouble to find your contact form and say, “hey buddy- your site is loading slow. I will be back here in 1 week to check to see if it’s fixed.”