See game benchmarks for the Intel HD 620 which includes the Sims 4 in the following link. Average FPS @ 1080p and high settings is about 29 FPS, however, that is with a Core i7-7500u and 16GB of RAM (2 sticks of 8GB RAM). Click FPS results to see laptop specs.
https
/www.notebookcheck.net/Intel-HD-Graphics-620.172256.0.html
When two sticks of RAM are installed, the RAM runs in dual channel mode. If there is only 1 stick of RAM then it runs in single channel mode (half speed). Two sticks of RAM can improve integrate graphics performance by 10% - 15%, but it varies depending on the specific game.