Purchase a fast or a USB 3.0 (or higher) flash drive. Standard mechanical external hard drives may cause long loading screens.
Check that you have the latest version of WickedWhims matching your game patch. Mod conflicts are a common cause. Remove all mods, add them back in small batches, and test the game each time to find the culprit. sims 4 vagina mod portable
For Sims who want "on-the-go" fun and deep social interactions: Purchase a fast or a USB 3
It reduces the "neglect" buff, meaning your Sim won't be miserable if they are away from their home computer for a few hours. Conclusion add them back in small batches