Ghost Spectre is not an official Microsoft product. It is a "modded" or "tweaked" version of Windows 10 created by the community (specifically by a developer known as "Ghost Spectre"). It is designed to strip away all the "bloatware" and unnecessary system processes that slow down low-end hardware. For a 32-bit system, which is inherently limited by memory (RAM), this is arguably the best performing version of Windows 10 available , provided you are willing to accept the security risks of using an unofficial ISO.
The installation size is roughly 13 GB, significantly smaller than a standard Windows 10 installation. System Requirements (32-bit) ghost spectre windows 10 32 bit top