some tricks would kind of boost up openbve for you but not that much such as
1)right clicking on your desktop screen, click personalize, go to window color and appearance, and selecting windows classic as the color scheme.
2) go to your system properties, click on advanced system settings, hit "Settings..." on the performance menu, and choose adjust for best performance.
I currently use both of these settings since my windows 7 laptop broked, and now i have to use my crappy old, but still working windows vista at this time.
Or if you want you can download Game Booster, its free of charge and stops unnecessary programs on your laptop in order to give you as much fps as you can