For over a year I used a Themify Theme for my WordPress Site. Themify have some of the most beautiful and feature rich Themes around. I however decided to use a StudioPress Theme for my new-look Website purely because I have worked with StudioPress alot lately and they too are very well coded.
Two things I absolutely had to have with the new Website was the ability to use LESS CSS as well as have a good responsive Theme. LESS CSS is one of the biggest time savers I’ve discovered over the past year and having a mobile friendly Site is absolutely essential nowadays. There is much more to having a mobile friendly Website than merely using a responsive Theme and CSS can help with this e.g. The Page background image of my new WordPress Website doesn’t display on mobile devices as mobile devices often don’t cache content too well.
As for the load speed of a Theme, one should really use a Theme that uses CSS instead of images wherever possible. StudioPress responsive Themes, such as the Minimal child Theme I use on my Site, is extremely well coded when it comes to using CSS in place of images. Google and other Search Engines use Page load speed in ranking so Page speed is important as SEO. Another means of using CSS in place of images is on my Home Page where I use font icons in place of images; I use Font Awesome (part of Twitter Bootstrap) on my Site which makes the icons look of a high quality from retina through to low resolution devices while being super fast to load.
Something I may well do still is move from CloudFlare as a CDN back to Amazon CloudFront using Route 53 DNS (and S3 for remote backup storage). I used Amazon Web Services to speed up my Site delivery for awhile and decided to try out CloudFlare. While there is nothing wrong with CloudFlare and CloudFlare is a bargain being free, I just like the greater control available using CloudFront for CDN and Route53 for DNS hosting.
Check out my new WordPress Website and let me know if you need a new super awesome WordPress Site.