It's been over two years since The Sims 4 dealt with an issue that was defined by the community as "Massive Lag When Switching Between Build/Buy Mode". This issue basically causes a huge drop in frames when switching between game modes, harming the gameplay.
Please do all of the following: 1) Move the Mods Folder to your desktop. 2) Delete the localthumbcache.package file in the game folder. This is very important! 3) Fix you game in Origin by logging in and go to Library, then right-click on The Sims 4 and choose the "Repair Game" option from the list. . 366 508 91 237 137 204 402 180