It's not just web pages, modern software engineers just make terribly unoptimised programs. Why does a recent game on a powerful pc take longer to open that old

It's not just web pages, modern software engineers just make terribly unoptimised programs. Why does a recent game on a powerful pc take longer to open that old DOS games? Not just loading a level, but even getting to the start screen takes ages. Wtf takes 20+ seconds to show a menu of New - Load - Options.... (drm probably)