Fast Startup on Windows enhances boot times by placing the computer in a hibernation-like state, saving the system state to disk for quicker startups, but does not preserve open programs and processes. Disabling Fast Startup is advisable for users with modern SSDs unless they experience noticeable slowdowns. Fast Startup circumvents traditional shutdowns, which are necessary for proper power cycling of components, potentially leading to system issues over time. It can disrupt Windows updates, causing instability and missing features, making it wise to keep it disabled for regular updaters. For dual-boot systems with Windows and Linux, Fast Startup should be disabled to avoid boot issues and potential data corruption. It can also exacerbate wake-from-sleep problems, leading to slower wake times and peripheral malfunctions. Users with modern NVMe SSDs may find that Fast Startup offers minimal advantages and could even result in longer boot times.