Recommendation after 0.4.9

[xarthurx]

So I have two machines, A uses 0.4.9, and B uses 0.4.4.

Because of the modification in 0.4.9 the mining speed of A machine us around 0.4-0.7x of B, tested over 8h of time.

Additionally, for the 0.4.9 version, there is a bug in checking balance or rewards:

❯ ore --keypair ~/.config/solana/id.json balance
Error { request: None, kind: RpcError(ForUser("Account could not be parsed as token account: pubkey=HiYdZP1Dqgb6evkg31w9cVVD9kp8zs1F6vAgCEavdyfx")) }

where the pub key is not associated with my account. (0.4.4 works all fine).

Recommendation:

1. Increase the difficulty of mining (I assume this means finding a valid hash).
2. Bug fix of the above mentioned issue.
3. Disable the request of version < 0.4.9 so that the network load can also be reduced.