Unless the DVD program has a way to adjust a buffer (which would be stored on your hard drive), then no. The other way, and this is if you had the schematics and knew what you were doing, is to replace the buffer memory chip on the CD-ROM unit itself.
Other more practical ways would be to 1.)try using a lens cleaning disc; or, 2.) buying a faster CD-ROM unit (if that's even a possiblity).
If the laptop's CPU isn't that fast (below 500MHz Pentium 3), then the CPU might be an issue. Unfortunately, the way laptops are generally designed, the CPU is soldered onto the motherboard, thus making that type of an upgrade undoable.