For a long time Joomla has included a very powerful component to handle url redirects. This is especially useful after a site upgrade or redesign. Don't know how to use it? Check this great article explaining all the features by Ruth Cheesley in the Joomla Community magazine.
However it had a problem which probably meant that you looked at it, set it up and then quickly abandoned it for something else.
You've probably noticed that I use some pretty big photos on each blog post here. That should mean big file sizes - but it doesn't have to.
When you take a high resolution digital photo and simply resize it for your web site you are NOT compressing it. Or if you are, then you are probably not compressing it as much as you could be.
The web was meant to be read, not squished.
This isn't the way to test a responsive design.