Will it be able to convert DVD to iPhone 5S faster than ever before?

When I get an iPhone 5S, I find this cellphone is a bit thinner and bigger than iPhone 4S which I used before. There's a problem when I want to watch DVD movie with iPhone 5s, because I can't connect an external DVD Drive. In fact, I was also very curious about whether it will be able to convert DVD to iPhone 5S faster than ever before. Can any guys tell me about this question?

It depends on your computer hardware performance. Better computer will convert the DVD faster. If you don't know how to convert DVD to MP4 video for iPhone, this guide will help you.

May not. It's up to several factors. A good PC and a great DVD converter are must-have factors.
If you are a PC user, enolsoft DVD to iPhone converter:
http://www.enolsoft.com/dvd-to-iphone-converter.html
For Mac users, recommend the voilabits one to you:
http://www.voilabits.com/dvd-ripper-mac.html