You can select Engine Settings option under the drop down menu on top bar. It will navigate to engine settings options and allocate more RAM and CPU to boost up BlueStacks performance.
You may also choose the "Graphics Mode" for the app player according to app compatibility. If there are any graphics related issue on any app like black screen or distorted graphics, change the graphics mode and restart the app player. Changes will be applicable after restarting BlueStacks.
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