Typing 'primespersec' in the console returns 'Method not found (code -32601)'. Anyone else getting this?

However, 'getmininginfo' shows:

{
"blocks" : 3449,
"currentblocksize" : 1000,
"currentblocktx" : 0,
"errors" : "",
"generate" : true,
"genproclimit" : 2,
"primespersec" : 76,
"pooledtx" : 0,
"testnet" : false
}

The CPU certainly sounds like it's mining! Though no blocks found over night