There is no known fix or workaround just yet for the month-start hesitations, nor for the autosave lag in Ironman mode. Some of the new additions include options to disable Pagan reformations, change the Man-at-Arms limits and cap, and set how often the AI chooses the Temptation lifestyle. If none of the above helps you can try any of the low-res mods in the EU3 User Mods forum also is it presumed and hoped that Paradox will further optimise EU4 performance in upcoming patches (1.1.3 was just release at the time of writing this, so after that). More Game Rules The More Game Rules mod increases the amount of customization that players have access to when starting new games. Note that EU4 is less forgiving than CK2 for under-spec video cards in particular. The game is a sandbox environment, and while there is no strict rule on winning the game, the game of the player is over when the players nation is removed. Open settings.txt in your documents folder (see this article for where to find it) and change lines to read as below (you should experiment with these, not all will necessarily help and some will reduce map features). If this the case for you, you may be able to improve the performance by disabling various graphical options. If you're running the game on an older computer or a laptop, you may notice some 'lag' or low framerates (game feels sluggish).

Ck2 change game rules