I made a change hat lets you change the animation easings in dconf, you can check that change done here https://github.com/erandros/gala/commit/183b43ab851223f7c3d0b6401f7ad6768ce1876e

And here’s the script to replace gala with t

sudo apt-get install git automake autopoint gettext gnome-settings-daemon-dev gsettings-desktop-schemas-dev libbamf3-dev libcanberra-dev libcanberra-gtk3-dev libclutter-1.0-dev libgee-0.8-dev libglib2.0-dev libgnome-desktop-3-dev libgranite-dev libgtk-3-dev libmutter-dev libplank-dev libtool valac
git clone https://github.com/erandros/gala
cd gala
./autogen.sh --prefix=/usr
make
./src/gala --replace

or if you want to install it

sudo make install

Then you can

dconf-editor

And go to org.pantheon.desktop.gala.switching and change the easings there.