@wcimbrelo we will take a look at the text issue your describing, try deleting all text boxes and adding new ones, I will add the issue regarding the ' to be fixed in the next release.
The next release has already addressed the positioning of the text, left, center and right. It works on the stage but was not visible in the editor in previous versions.
The reason the images are not appearing on the search page is because the search is a subdomain and links within wordpress are related to the domain it which is has been installed which in your case is the root of the domain.
We will see what can be done to address this problem for you.
In the Pro version there is the ability to add images from an external url, the main reason in doing this it allows you to use CDN's like Amazon CloudFront top speed up the loading of images.
Loading speed of the popup really comes down to the speed of your server and how your site is setup, if your using a shared hosting then the available resources are limited and you'd be wise to use a CDN to speed up your site.
The load time of Optin Revolution is very small and has been optimized.
Here's a post over at seomoz that may help.
We add the function to disable popups on mobiles to address this problem in the free version, we will be looking further into early this year.