Electrum was already tested and breaks down when I try to import my private key db(each wallet hold approx 10000 addresses). The limit to import is something about 25-40 a time.
The core is running from an external hard drive. Useraccounts I can create, but there will be some problem to run on each a different wallet. But if it can working, any advise is welcome.
My laptop capacity doesn't allow to have even one blockchain entirely be kept.
Thank you