Meh uses ImageMagick and is faster than Feh. I found that its claim is indeed true, it opens images in a flash, both from the shell and as default image viewer on the desktop.
$ git clone https://github.com/jhawthorn/meh.git
$ sudo apt install libgif-dev libjpeg-dev libx11-dev libxext-dev
$ cd meh $ make
$ sudo make install
Note that I highly recommend using checkinstall as described here instead of this.
$ meh * $ meh *.jpg
k: Move forward and backward through images
Esc: Close Meh
Note that Meh always displays the image zoomed correctly to fit the window. It changes as the window is resized. This is one of the biggest problems in Feb, which shows a zoomed in image by default.
You can make Meh your default image viewer by associating the various image extensions with it. To do this, first add Meh to the Open With list as described here.
Tried with: Meh 0.3 and Ubuntu 14.04