Premiere encode in h264 using "ultrafast" preset Often I use Premiere to transcode or export media where the final size isn't the main problem.

I'm used to the ultrafast preset from ffmpeg, what I wonder is.. it is possible to pick the same options that I generally use: QuickTime as container and H.264 but set also the ultrafast option ?

My pc is very slow and this would be a lifesaver for encoding times.
Not out-of-the-box as far as I'm aware. Those presets are specific to the x26* encoders. Premiere bundles Mainconcept's H.264 encoder. You can try third party plugins which allow one to use x264 from within Premiere:

https://sourceforge.net/projects/x264vfw/

http://www.x264pro.com/