Just to confirm

click the Start button
click Control Panel
click System and Maintenance
click Performance Information and Tools
click Advanced Tools (in the Tasks pane at the left side of the dialog box)
click Adjust the appearance and performance of Windows.

After answering the User Account Control prompt, you’ll arrive at the
Performance Options dialog box. You’re nearly there

click the Advanced tab, and then click Change.

 

Memory is not used as most would assume. The typical assumption is

real + pagefile = memory available​

when in fact

pagefile = memory available​

If you take the pagefile to ZERO, then there is no virtual memory available and
you've basically regressed the machine back into 8086 cpu processing

A modern system uses VM (Virtual Memory) into which processes are mapped
and the paging systems gives each process 'real memory' for execution.

If you want the best performance

• maximize REAL memory
• run a large pagefile size (~2 or 3x real)
• reduce the number of running programs to the absolute minimum