I am using an Asus X442UQ with
4GB of RAM, Core i5 - 8th Gen, 1TB HDD..
It was terribly slow and hanging sometimes.
If you go to task manager, on "Performance" tab, the MEMORY part, which is your RAM is on 100%.
So I bought an 8GB Kingston DDR4 ram and installed it to my Asus to have a total of 12GB of RAM,
and it is now running very smooth - a perfect machine.
Advise to you guys, since the RAM of asus is upgradeable, just upgrade your machine and all your "slow" problem will be fixed.