WARNING, DO NOT HAVE ANY HEAVY CPU/RAM USING APPLICATION. ZDOOM IS ALREADY ITS OWN HEAVY CPU/RAM USING APPLICATION! UNINSTALL ANY UNNEEDED/UNSUBSCRIBED PROTECTION SOFTWARE. NOTE THAT THIS GUIDE WILL NOT WORK AGAINST THE NEED FOR A RAM EFFICIENT DEFRAGMENTATION/OPTIMIZATION MAINTAINANCE! I WILL MAKE ONE USING BASIC RAM EFFICIENT SOFTWARE. THANK YOU FOR YOUR PATIENCE. 0. Activate fan if using a laptop model brand (its shell may overheat). 1. Wait for startup to finish loading. (may include connection icon, windows update, pc protection, audio/video applications, and battery/charger icons [this might take a maximum of 15 minutes!]) 2. Open the ZDoom config.ini (e.g. "zdoom-%") file w/ Notepad.exe. 3. Find the "vid_adapter=#" parameter. 4. Ensure that the vid_adapter parameter value is 0. http://zdoom.org/wiki/Frequently_Asked_Questions#Q._I_accidently_checked_the_box_which_prevents_ZDoom_from_letting_me_pick_my_IWAD.21_How_do_I_get_it_back.3F 5. Find the "vid_vsync=%" parameter. 6. Ensure that the vid_vsync parameter value is true. http://forum.zdoom.org/viewtopic.php?f=4&t=19782&p=386001& 7. Find the "vid_refreshrate=#" parameter. 8. Ensure that the vid_refreshrate parameter value is 0. //60-85. My own personal loading work-around. 9. Find the "fullscreen=%" parameter. 10. Ensure that the fullscreen parameter value is false. 11. Find the "vid_defheight=#" parameter. 12. Ensure that the vid_defheight parameter value is 200. 13. Find the "vid_defwidth=#" parameter. 14. Ensure that the vid_defwidth parameter value is 320. The things to be done. 15. Save ZDoom config.ini. 16. Run that ZDoom.exe and unfocus on ZDoom unloader window. 17. Have fun (but remember step 0, 1, and 16 before step 17 for each sequential execution).