progress is achieved through the same "building" named after it mainly , its infinite and auto sets itself to keep doing , look around in the buildings if you already have it unlocked, if you set it as the last building or only building it auto builds and keeps raising progress, you can look in the help tab too , it's on "religion & tech"
It loads really fast for me and it is only 2 mb big.
Not sure how fast your connection is, but 2 mb should load pretty fast if it is not too slow.
Do you run multiple unity games at the same time with firefox? This could cause some problems in some cases.
Other than that, it might help to deinstall your unity-plugin and install the newest version.
 "Cividlization 2"){kind=icon}
 "Cube Escape: Theatre"){kind=icon}
 "Idling to Rule the Gods"){kind=icon}
 "Sorcery Quest"){kind=icon}
 "Snailiad"){kind=icon}
 "Hands of War"){kind=icon}
It loads really fast for me and it is only 2 mb big. Not sure how fast your connection is, but 2 mb should load pretty fast if it is not too slow. Do you run multiple unity games at the same time with firefox? This could cause some problems in some cases. Other than that, it might help to deinstall your unity-plugin and install the newest version.