@staysecure, thanks! @krile, thanks too! Sure the swap can affect negatively in the wallet processing? I'm using an class10 sdcard and now i've been incrased the cpu clock to 1,1GHz all seems very stable, the room temperature is controlled to stay at 22ºC. I'm using another setup as you can see:

Clock generator:
https://s24.postimg.org/4fvoy2lo5/raspiclock.jpg

Primary frequency standard (for all system clock reference, works with cesium beam):
https://s17.postimg.org/5cjgx3a7x/primary_frequency_standard.jpg

System setup (counters, syntethyzer, GPS, NTP server):
https://s8.postimg.org/ndno6hp45/setup.jpg

The Pi:
https://s12.postimg.org/gdy33kt25/the_pi.jpg

Clock for my BR NTP server:
https://s13.postimg.org/piefa2r5j/beagleclock.jpg

Raspberry time synchronization:
https://s17.postimg.org/pb4ph4yml/Captura_de_tela_de_2017-05-06_09-07-43.png

Raspberry CPU Clock:
https://s16.postimg.org/yie3p73mt/Captura_de_tela_de_2017-05-06_09-08-01.png

This cesium frequency standard feeds a NTP server, Raspberry with NEVA wallet, a GPS for research with time and a counter for contabilize the time difference between the GPS clock and the generated clock by cesium beam clock. All the system is locked with the cesium beam frequency standard.

I think high cpu usage will be the problem too, but for now i only have this pi  when the univesity buy more new raspies i will pick one for this xD