The size of BlueStacks RAM depends on your computer RAM so please make sure that your system has sufficient amount of RAM to allocate greater amount of RAM for BlueStacks.
Don’t set the new size of BlueStacks RAM to more than half of your computer RAM, which will keep your PC stability unchanged.
My BlueStacks RAM size is 739 MB and I will increase it to about 850 MB.
You can install and use the Memoryinfo-SwapCheck app to display the RAM size like it shows in the image below.
Navigate to the folder C:\Program Files\BlueStacks and run the file “HD-Quit.exe” to stop all BlueStacks services and processes.
Press Windows logo key + R to open the Run dialog box.
Type in regedit > click on OK to open the Registry Editor > click on Yes if prompted by the User Account Control.
Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\BlueStacks\Guests\Android
Change the Base option to Decimal mode.
Input the value you want to allocate (in megabytes) for RAM into the Value data field > click OK > exit Registry Editor.
Note: If we enter the value of 1024 (1 GB), the BlueStacks RAM size will be increased to 850 MB.
Now launch your BlueStacks application and check the size of your new RAM. If you do not see any changes, restart your PC and re-check.
OPTIONAL: After that,you hit control+alt+delete to access task manager. Then you go to the processes tab and right clicked on HD-frontend and set priority to high and do the same thing for HD-agent.