How to reduce the frequency of the "RPC method invocations" arose as a result of ethers.js event listener?

[EhsanMarufi]

I'm using the on method on the Contract class provided by ethers.js, to set up an event listener for an event of a smart contract:

contract.on("Transfer", (to, amount, from) => {
    // ...
});

The Hardhat node console keeps logging some specific RPC methods as a result of the "event listener" (and nothing else):

eth_chainId
eth_blockNumber
eth_chainId (2)
eth_getLogs (2)
eth_chainId
eth_blockNumber
eth_chainId (2)
eth_getLogs (2)
eth_blockNumber
eth_chainId (2)
eth_blockNumber
...

I believe ethers.js continuously queries the blockchain-logs for matching events. I need to decrease the frequency of the "RPC method invocations" down. So, How may I achieve that?

[panukettu]

Without much context I would suggest using a websocket-provider.

That said, a few things to consider if that is not an option:

• You can get rid of the eth_chainId calls by using StaticJsonRpcProvider instead of eg. JsonRpcProvider.
• You can then try setting the provider.pollingInterval to a higher value. Important thing to consider with this is that to my knowledge the poller only gets logs for the 10 most recent blocks. So if pollingInterval is higher than block time * 10, it will miss blocks (and the events) built after the previous poll.