Personalized content will be problematic. Access rights and filtered links as well. I would implement caching using object caching if you need it for logged in users. There are plenty of opportunities to shoot yourself in the foot though :)

If you want to force caching on some page types, like articles or similar, where you know you won't have personalized content, you can use this attribute:

public class ForceContentOutputCacheAttribute : ContentOutputCacheAttribute
{
    public ForceContentOutputCacheAttribute()
    {
        this.UseOutputCacheValidator = (principal, context, duration) =>
        {
            if (duration != TimeSpan.Zero)
                return context.Request.HttpMethod.Equals("GET", StringComparison.OrdinalIgnoreCase);
            return false;
        };
    }
}

And on your controller:

[ForceContentOutputCache(Duration = 3600)]
public class ArticleController : PageController<ArticlePage>
{
}

Hi,

Thank you very much for the inputs. 

Br

Lasse