My old machine was a P4 2.8 with 2 gigs of ram and it had a score of 1700. It would render and play 6 RT's just fine but it was sloooow rendering that many RT's. It would take between 45 seconds and a minute or so but no stuttering or anything, playback was clean. My new machine does it in 6-10 seconds depending if one of the RT's is a solo or not. Rendering a solo RT seems to take much more processing than a regular RT. With a score of 900 on yours it's time for a new machine or even a newer used one if money is really tight. You can get a used core duo for $150-200 from Goodwill or most any PC repair shop that is still faster than my old box. Don't even bother trying to upgrade you'll just frustrate yourself.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.