How can I rewrite a reflection code with FastMemeber library?

I want to get context form DbSet with below code, because Reflection is heavy I want to rewrite blow code with another code with better performance

Can anyone help me for a solution with better performance or rewriting code with FastMember library ?

    public static DbContext GetContext<TEntity>(this DbSet<TEntity> dbSet)
    where TEntity : class
    {
        object internalSet =
            dbSet
            .GetType()
            .GetField("_internalSet", BindingFlags.NonPublic | BindingFlags.Instance)
            .GetValue(dbSet);
        object internalContext = internalSet
            .GetType()
            .BaseType
            .GetField("_internalContext", BindingFlags.NonPublic | BindingFlags.Instance)
            .GetValue(internalSet);
        return (DbContext)internalContext
            .GetType()
            .GetProperty("Owner", BindingFlags.Instance | BindingFlags.Public)
            .GetValue(internalContext, null);
    }

Thanks