Comparing using ArrayPool.Shared and instance created with ArrayPool.Create.

private static readonly ArrayPool<Vector2> CreatedPool = ArrayPool<Vector2>.Create(Settings.StepsCount, 4000);

public static ArrayPool<Vector2> GetPool()
{
    if (UseShared)
        return ArrayPool<Vector2>.Shared;

    return CreatedPool;
}

Code in main is look like this:

Execute();
AllocationMode.UseShared = false;
Execute();

BenchmarkDotNet=v0.13.1, OS=Windows 10.0.22000 AMD Ryzen 7 5800H with Radeon Graphics, 1 CPU, 16 logical and 8 physical cores .NET SDK=7.0.100-preview.4.22252.9 [Host] : .NET 6.0.5 (6.0.522.21309), X64 RyuJIT DefaultJob : .NET 6.0.5 (6.0.522.21309), X64 RyuJIT

DotMemory trace with changing allocation mode:

Allocated objects while we using ArrayPool<Vector2>.Shared:

Allocated objects while we using pool form ArrayPool<Vector2>.Create: