ah, too late, network hash already 200 M/s
{
    "blocks" : 1701,
    "currentblocksize" : 1000,
    "currentblocktx" : 0,
    "difficulty" : 3.47153714,
    "errors" : "",
    "genproclimit" : -1,
    "networkhashps" : 202394650,
    "pooledtx" : 0,
    "testnet" : false,
    "chain" : "main",
    "generate" : true,
    "hashespersec" : 247174
}

me only has 250 K/s