WinUtil by Chris Titus Tech. It includes a “Standard” debloat (safe for gaming) and a “Tweaks” tab specifically for gaming (disable Nagle’s algorithm, increase GPU priority).
Select “GPT” for UEFI systems, “MBR” for legacy BIOS. Enable “Remove requirement for 4GB+ RAM” if you’re installing on an old machine. best custom windows 10 iso for gaming
Use Macrium Reflect or Clonezilla to image your current drive. Custom ISOs can break drivers or WiFi adapters. WinUtil by Chris Titus Tech