RFCE has many custom art, which may ask a lot of your computer. (especially the new leaderheads) Some computers can't handle it. To avoid this, you can do the following: Go to the XML files of RFCE --> Art. Rename the "CIV4ArtDefines_Leaderhead.xml" (it doesn't matter to what, as it gets an other name). Rename the "CIV4ArtDefines_Leaderhead.xml_light" to "CIV4ArtDefines_Leaderhead.xml" (remove the "_light"). You should do the same for "CIV4LeaderHeadInfos.xml" and "CIV4LeaderHeadInfos.xml_light". (You can find these in XML-->civilizations) If you do this, the mod will use the vanilla art files for the leaderheads. This releases some stress of your computer, because it doesn't need to load the new custom art. But if you have a new computer which will very probably meet the requirements of the mod, you can forget this.