[Bug]: ReactiveProperty very slow with many subscriber

[DevEngineReq]

Describe the bug 🐞

Recently we moved the ReactiveProperty from Reactive.Bindings.ReactiveProperty to ReactiveUI.ReactiveProperty.
Now we encountered massiv performance problems for the following use case.

If you subscribe a ReactiveProperty very often, the application will freeze. It is very performace intensiv.
With Reactive.Bindings.ReactiveProperty it was not a problem.

Example

public class BasicComparisonViewModel
{

    private readonly SourceCache<BasicViewModel, int> cache = new(static x => x.Id);

    // ReactiveUI => slow
    public ReactiveProperty<int> Property => new (42);

    // System.Reactive => fast
    //public Reactive.Bindings.ReactiveProperty<int> Property => new Reactive.Bindings.ReactiveProperty<int>(42);

    public BasicComparisonViewModel()
    {
        this.cache.Edit(x =>
        {
            for(var i = 0; i < 3000; i++)
            {
                x.AddOrUpdate(new BasicViewModel(i, this));
            }
        });
    }
}

internal class BasicViewModel
{
    public int Id { get; }

    public BasicViewModel(int id, BasicComparisonViewModel vm)
    {
        this.Id = id;

        vm.Property.Subscribe();
    }
}

Our measurements
Reactive.Bindings.ReactiveProperty: ~3ms
ReactiveUI.ReactiveProperty: ∞

Step to reproduce

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Reproduction repository

https://github.com/reactiveui/ReactiveUI

Expected behavior

This should happen...

Screenshots 🖼️

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IDE

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Operating system

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Version

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Device

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ReactiveUI Version

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Additional information ℹ️

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