I want to speed up one of my websites which is enjoyed across the globe. Would one easy way to do this involve using a CDN? I don't fully understand what they are they yet, but I have some vague notion of what they do. I know the name cloudflare and that they have a free plan. This is the limit of my knowledge, any insights, teachings or advice would be well received I also have no idea on what is involved to start one up. thanks.