Hi Rodrigo,
>> Could SSL improve the performance?
no. SSL makes performance a little bit worse. But it's not really noticable.
>> I know its better for security reasons.
YES. Basically if you are using non-SSL then you should consider all the data to be completely public. (Which is obviously ok for many sites.) But if you have a login and the site is not SSL then you should consider the login to be pretty easy to bypass.
>> Its a lot of work to make my site SSL?
no. It's very simple.
a) get certificate
b) tick "Use SSL" checkbox in app.
cheers
Bruce