The patches doesn't really change that much inside the game that changes how well it runs on a bigger scale, so I actually find this a tad bit "meh".
sure, more content is added to the game. But it's still the same engine inside the game, patches doesn't cause the lag or a slow game in general.
As far as I know. Since the launch of the game in January, there has been no bigger graphical enhancements to the game. If your game would get more laggy from a patch you probably need to take a look on the comp in general and how you handle it cause a patch shouldn't really give problems, they should solve them in most cases xD