I installed Voukoder to get the often mentioned speed bump in rendering.
Voukoder is not about getting a speed bump. It is about making additional encoders available. Please read: Voukoder Performance Analysis
The first sections should explain quite alot.
Until now Ive had my workflow in Premiere, just set the bitrate, H264, done. Now there are things like QPI QPR, LCVB, and other things, for which apparently you have to study rocket sience first 
You should have "Advanced settings" settings disabled to hide the most confusing settings. Setting a bitrate makes only sense if you taget a specific file size. Use a quantizer based rate control. This defines basically the quality / filesize ratio.
You don't need to study rocket science, but using media encoders requires some kind of basic knowledge.
What I also dont quite understand is, that in version 0.7.2 the options for the encoder were directly visible in the program window of Premiere, now with newer versions one has to click through subwindows to get the same functionality. From my understanding, a newer version should always succeed the older one not only by version number, but also regarding usability.
Voukoder got an external interface to make it available to other programs besides Premiere only (i.e. Vegas Pro, After Effects, ...)
In your case: Just select "Profile: High", "Encoding strategy: CQP" and "CQP Value:" to something aroung 15. Smaller values better quality / larger filesize.
And please read the forum post mentioned above.