Do we know the enemy count in pre vs post staircase patch? In these comparisons the game on 360 still goes into slomo and the enemy count looks the same on 1X.
I do remember when playing post patch there was a decrease in enemies but now completely forgot what the full enemy count looked like in prepatch to grasp the differences.
The Xbox 360 version was using the latest patch available, the game was also installed on a HDD. I've read it runs even worse, if you play the game off the disc.
So if they're using the same code as the X360 version, it should also be applied to the X1X version. The worm fights, is still bugged in the X1X version as well. But these were only fixed in the PS3 version, and that version also dropped the worm boss segment.