Based on Ray Tracing in One Weekend, Version 3.2.3, 2020-12-07.
See also C# implementation.
$ git clone https://github.com/ronnieholm/Ray-tracing-in-one-weekend-FSharp.git
$ dotnet run --configuration release RayTracingInOneWeekend.fsproj > out.ppm
$ display out.ppm
The F# implementation is based on newer version of the book than the C# version. So benchmarks aren't comparable:
.NET 8 (Linux)
$ dotnet run --configuration release RayTracingInOneWeekend.fsproj benchmark
Render time: 00:01:24.4251590