Slimmer, Slicker!
Cut out the fat, til’ you reach the bone! I went over my old F-16D, and combed every last part which I deemed unnecessary. As a result, a ~25% part count reduction was achieved. Much better on your PC/Laptop! Still, I doubt that 290 parts will run smoothly on lower-end specs.
Much better than 400+ though…
A stock aircraft called F-16D SLIM. Built with 291 of the finest parts, its root part is strutCube.
Built in the SPH in KSP version 1.12.3.