diff --git a/seedemu/services/EthereumService.py b/seedemu/services/EthereumService.py
index 39d6fc782..098bbef79 100644
--- a/seedemu/services/EthereumService.py
+++ b/seedemu/services/EthereumService.py
@@ -131,9 +131,9 @@ def install(self, node: Node, eth: 'EthereumService', allBootnode: bool):
         # launch Ethereum process.
         common_args = '{} --identity="NODE_{}" --networkid=10 --verbosity=6 --mine --allow-insecure-unlock --rpc --rpcport=8549 --rpcaddr 0.0.0.0'.format(datadir_option, self.__id)
         if len(bootnodes) > 0:
-            node.appendStartCommand('geth --bootnodes "$(cat /tmp/eth-node-urls)" {}'.format(common_args), True)
+            node.appendStartCommand('nice -n 19 geth --bootnodes "$(cat /tmp/eth-node-urls)" {}'.format(common_args), True)
         else:
-            node.appendStartCommand('geth {}'.format(common_args), True)
+            node.appendStartCommand('nice -n 19 geth {}'.format(common_args), True)
 
     def getId(self) -> int:
         """!