Trick or ruby on the rails
personally I would choose cakephp at this point. php and mysql are very common on most web hosting packages, even free ones. it is php based and there are a huge number of resources to learn and help. you can reuse many classes already written. regarding the speed of cakephp, there are ways to speed up cakephp in production through coding and caching techniques.
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Why switch? Since you have your initial start on CakePHP, take a short break.
Learn a little Ruby on Rails, then switch back to CakePHP when the mood hits you.
This way, in the end, you will gain knowledge of two languages / frameworks, not just one. It's always best to get as much exposure as possible. Each has its own advantages and disadvantages, but why not study enough to make a decision on your own?
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None is better than the other. While some may be more suitable for specific applications than others, they are certainly good frameworks.
They say PHP is faster, Ruby is objectively a better developed language. They probably matter more than the framework itself - you can always change the libraries or write your own classes to make the framework do what you want.
My advice is to stick with what you know, if you like it - learning a new structure is a long process. If you have problems with Cake or want to try something different, Rails is definitely worth it.
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I recently read a good article from a developer with a CakePHP base who has just completed a large Ruby on Rails project.
http://www.jimmycuadra.com/blog/10-from-cake-to-rails
It details where Rails is stronger than Cake, but also vice versa. Another blog post compares Ruby and PHP here.
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