Problems with Adobe Premiere

[d3rrial]

Hey there, I am aware that his is probably in the wrong section, but I couldn't find a better fitting one. If there is, I would ask you to please move this thread!

OK. So now here's my Problem:

I record Gameplays with Dxtory in 720p, with 2 Sound Inputs (System Sound and Microphone). When I now import these files to Adobe Premiere, I can do anything just fine, except that the second audio track (Microphone) is missing. That is a known problem but not the one concerning me. So that isn't really the problem. My problem is rather: When I want to render this Video now it takes up at least 1 hour. When I have a File with the same size, same length but only one audio stream in the source file, it renders in mere minutes.

tl;dr: I have no clue what causes the rendering to take so utterly long when I use a sourcefile with two audio streams...

If anyone knows why, or how I can fix this, I would much appreciate it!

Edit: I should probably have mentioned this: I use Adobe Premiere CS6

[Fisher]

You're using the wrong software imho. Try Sony Vegas Pro, it lets you use raw gfx power to render faster. It also should be able to handle dual audio sources =)