Its not any harder to rack the slide infact i find it smoother and easier then the squeeky rough factory spring setup. It racks with less noise nice and smooth. It might be harder to pull back if your a girly man.
I don't take offense to this statement but will try to show you my reason for my statement above...
The OP asked a question, and I provided an answer based on what little I know. But the facts are that the extra power recoil springs due infact make it tougher to rack the slide. You need to exert more pressure to accomplish this task...
Now here is the reason I mentioned this fact, you are involved in a gun battle which happens in microseconds, your gun needs a magazine change or malfunctions...you lose use of yor strong hand for whatever reason...you need to rack the slide to get back in the fight to save your butt...OH that's right you have that 22# spring inside the pistol. How do you use your weak hand to rack the slide to get your weapon to function?
You shove the sights against something like your pants leg, belt, buckle or an object to hook the sights rack the slide to place the firearm back in battery to fire an other round.
Do you see what a challenge this presents to you in this situation? Your pistol could cost you your life rather than save it.