It can still be done in XP. And Bagginsbill was just referencing this the other day... I assume he runs Vista somewhere.

In Windows Task Manager, select the Processes tab and right click on the application name. There's a Set Priority option.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3