You don’t have to replace all the parts, just the battery and throw in some extra RAM if you can. If it doesn’t have an SSD yet that’s another thing to replace

You don’t have to replace all the parts, just the battery and throw in some extra RAM if you can. If it doesn’t have an SSD yet that’s another thing to replace. But replacing the CPU is usually not good value. Old top of the line parts are still pretty expensive (since there are at most two generations of CPUs for a platform there is not much to choose from), so that’s usually not worth it.