{
	"threads": 2,

	"proxy": {
		"listen": "0.0.0.0:8546",
		"clientTimeout": "3m",
		"blockRefreshInterval": "250ms",
		"hashrateWindow": "15m",
		"submitHashrate": false
	},

	"frontend": {
		"listen": "0.0.0.0:8080",
		"login": "admin",
		"password": ""
	},

	"upstreamCheckInterval": "5s",
	"upstream": [
		{
			"pool": true,
			"name": "EuroHash.net",
			"url": "http://eth-eu.eurohash.net:8888/miner/0xb85150eb365e7df0941f0cf08235f987ba91506a/proxy",
			"timeout": "10s"
		},
		{
			"name": "main",
			"url": "http://127.0.0.1:8545",
			"timeout": "10s"
		},
		{
			"name": "backup",
			"url": "http://127.0.0.2:8545",
			"timeout": "10s"
		}
	],

	"newrelicEnabled": false,
	"newrelicName": "MyEtherProxy",
	"newrelicKey": "SECRET_KEY",
	"newrelicVerbose": false
}

{
	"threads": 2,

	"proxy": {
		"listen": "0.0.0.0:8546",
		"clientTimeout": "3m",
		"blockRefreshInterval": "100ms",
		"hashrateWindow": "15m",
		"submitHashrate": false
	},

	"frontend": {
		"listen": "0.0.0.0:8080",
		"login": "admin",
		"password": ""
	},

	"upstreamCheckInterval": "5s",
	"upstream": [
		{
			"pool": true,
			"name": "EuroHash.net",
			"url": "http://eth-eu.eurohash.net:8888/miner/0xb85150eb365e7df0941f0cf08235f987ba91506a/proxy",
			"timeout": "10s"
		},
		{
			"name": "main",
			"url": "http://127.0.0.1:8545",
			"timeout": "10s"
		},
		{
			"name": "backup",
			"url": "http://127.0.0.2:8545",
			"timeout": "10s"
		}
	],

	"newrelicEnabled": false,
	"newrelicName": "MyEtherProxy",
	"newrelicKey": "SECRET_KEY",
	"newrelicVerbose": false
}

Set blockRefreshInterval to reasonable 100ms value
Set blockRefreshInterval to reasonable 100ms value
