Yes that s what i meant the territory of ottoman empire to much easier to defend.No matter how much land you gain and conquer you come to a point where you reach your natural expansion then you have to start defending your gains.
Spanish conquered from Argentina all the way to the Philippines.
Eventhough the Spanish Empire was bigger than the Ottoman Enpire in land mass.
Spanish Empire declined much quicker than the Ottoman Empire as they had to defend all those colonies from the Americas to the Far East.
Ottoman Empire reaching Ww1 despite on its last legs was more relevant to the balance of power in Europe than Spain and Portugal.
Ottoman Empire, Spain and Portugal all began to decline at the same period.
Until Russian used hundreds years and millions population to conquer Ukriane and Crimean,the core of ottomans was safe.