Website performance is arguably the single most important area where you can invest your development time and resources. No matter how unique your marketing message is, or how empowering your product, you will not see conversions if your site is slow to load. Mobile users on fast connections are still subject to network intermittencies. Peak traffic congestion can degrade the speeds that visitors normally connect with. Even disregarding dialup users, plenty of your desirable segment of visitors may be browsing from airports, traveling internationally, or at a coffee shop.