Greetings, I may be able to help. I've had the same problem with stutters and lag.
Go to your Soulstorm install folder and then go to the drivers folder. Open spdx9_config.txt and look for "allowhwcursor 1" (without quotes) and change the 1 to a 0. Then save it
That worked for me, i don't know if that will work for you.
venron42
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