Checkpoint snapshots of segments of system memory are taken while an operating system is booting in a computer system. The segments of system memory are stored in non-volatile memory as hibernation files. In response to detecting a request for a system reboot of the OS, an affected hibernation file, which corresponds to an affected segment of system memory that will change during the system reboot of the OS, is identified. A restoration of the system memory via a wake-up from hibernation is then initiated. The wake-up from hibernation proceeds until the affected hibernation file is reached, such that initial steps in the system reboot are bypassed. Thereafter, subsequent steps, which are after the bypassed initial steps in the system reboot, are executed.