I would certainly do as was mentioned and put a fresh set of Wolff springs in that old warhorse. I collect vintage military pistols (C&R shooter grade) , and whenever I get a new toy , I put at least a fresh recoil spring in before firing.

Most data shows the WWII German 9x19mm Parabellum/Luger ammo was quite hot , and much later ammo used a 115gr bullet made of sintered iron , as lead/copper was getting very scarce. Most SAAMI 9mm+P is comparable to WWII. USGI M882 9mm NATO is also in the +P class. My Luger and Lahti seem to choke on standard US commercial 115gr, but run great with 115-124 +P of USGI 9mm NATO