This is a long shot, but try Options > Return to Factory Settings.

Do you have any other programs running on the computer, especially anything else like a DAW or something that might be CPU intensive?

Can you start Task Manager (right-click on the Toolbar) and see what other programs are running? To do this: Select More Details, then the Processes Tab, then click on the CPU column to sort by what's using the most processing power of your computer.

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BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones