For a few days of using Linux 1.4. wallet I can say, that it is staking really nice and wallet is responding. It is taking 100% of one cpu(core) and 2.1GB RAM , but not a problem with crashing or something.
I have got around 90 000 transactions.

I recommend to use some virtual machine (VMWare for example) , with Ubuntu (2 cores + 4-5GB RAM would be enough) installed and just launch Linux JPC wallet.

So it is possible to use a wallet, but if anybody can fix the Windows wallet , it would really help.