Does anyone have much experience with services like Cloudflare? I am specifically interested in premium DNS, speeding up HTTPS handshakes and CDN (having all the static content loaded via subdomains)?

I've checked my site's performance on these speed checkers and it comes up as something like 97% faster than other sites. The only issue is my static resources are delivered with cookies. The actual server side generation of pages is between about 1 and 60 milliseconds, depending on complexity. Though I also have full HTML caching bypassing the server side entirely - currently disabled, but will turn it back on soon after some changes.

The big issue I've noticed is that the DNS lookup and HTTPs handshake of my site can take up to around 200ms from a relatively close server. When loading Cloudflare sites I've noted that they can do DNS and HTTPS in about 30 milliseconds.

Does anyone use any of these optimising services like CloudFlare? What would you recommend and how would you say it affects SEO?