The funny thing is that my second computer is faster, the specs are
1.I5-4440,8gb 1600mhz RAM, 2gb Radeon 7770 GHz
2.I5-4670K,16gb 1600mhz RAM,4GB GTX 770 OC,
but yeah when I create the game on the faster computer(2nd) then it´s ok(there´s absolutely no loading time on both computers) and we´ve played this map about 8h and the frame rates are
1.~250 fps
2.~500 fps
I tested it again to create the game on the 1st pc and it took almost 10 minutes to load the map for the 2nd computer(at least it didn´t crash like I thought at the first place). But I´m happy cause everything runs smoothly for the both of us on the map created on the 2nd computer :)