Generally pc with little ram is much likely to have alot of lagging and freezing while playing high graphics games, Back in those days, we buy a new ram stick to improve our pc performance, but now you can increase your pc ram at no cost.
The very way to improve pc performance with no cost is with use of a virtual ram,
What virtual ram does is to create a space from the hard disk so the system can utilise the created space as ram, giving you the ability to run as much program as you want.
The link to download the virtual ram
https://www.datafilehost.com/d/c7d70923

How to Configure the virtual ram
After installing the software
Goto setting, click enable virtual
Then create the size of ram of want, maximum is 4gb
After creating, click resize hard disk
Wait for the process to be completed
Then reboot your pc
Now you have extended your pc ram by the amount of size you created