I've found that if I open an image in Emacs over 1MB it starts to take a while. I justed opened up a 3MB and it took 16seconds. I'm just using the default image-mode is there a better way?
Is there a way to shrink the preview image before putting it into a buffer? Maybe using imagemagick?
Update When I type in './configure --prefix=/opt/emacs-26.0.50 --with-xft' it already says I'm using imagemagick, do I have to recompile with --with-imagemagick? It doesn't seem to change this list if I configure with-imagemagick.
Where should the build process find the source code? . What compiler should emacs be built with? gcc -std=gnu11 -g3 -O2 Should Emacs use the GNU version of malloc? yes (Using Doug Lea's new malloc from the GNU C Library.) Should Emacs use a relocating allocator for buffers? no Should Emacs use mmap(2) for buffer allocation? no What window system should Emacs use? x11 What toolkit should Emacs use? GTK3 Where do we find X Windows header files? Standard dirs Where do we find X Windows libraries? Standard dirs Does Emacs use -lXaw3d? no Does Emacs use -lXpm? yes Does Emacs use -ljpeg? yes Does Emacs use -ltiff? yes Does Emacs use a gif library? yes -lgif Does Emacs use a png library? yes -lpng12 Does Emacs use -lrsvg-2? yes Does Emacs use cairo? no Does Emacs use imagemagick (version 6)? yes Does Emacs support sound? yes Does Emacs use -lgpm? yes Does Emacs use -ldbus? yes Does Emacs use -lgconf? no Does Emacs use GSettings? yes Does Emacs use a file notification library? yes -lglibc (inotify) Does Emacs use access control lists? no Does Emacs use -lselinux? no Does Emacs use -lgnutls? yes Does Emacs use -lxml2? yes Does Emacs use -lfreetype? yes Does Emacs use -lm17n-flt? yes Does Emacs use -lotf? yes Does Emacs use -lxft? yes Does Emacs use -lsystemd? no Does Emacs directly use zlib? yes Does Emacs have dynamic modules support? no Does Emacs use toolkit scroll bars? yes Does Emacs support Xwidgets (requires gtk3)? no Does Emacs have threading support in lisp? yes
Update: How I build emacs
Here is how I'm compiling emacs under Debian Jessie (64bit)
cd ~/src/emacs-master git pull ./autogen.sh ./autogen.sh git ./configure --prefix=/opt/emacs-26.0.50 --with-xft --with-imagemagick make bootstrap -j32 sudo make install
Output from configure command https://gist.github.com/map7/ebbec3c6ce491180099bde6e7c1a5fa3