I am syncing a testnet node right now because I am in a hurry to test an application that uses the node's rpc.

But I would like to let this web app running calling rpc on testnet while the mainnet is synchronizing, in the same computer..

I would have tested it already, but the testnet is still syncing.. have some one tried this before? if yes, would the testnet daemon make the mainet synchronization a lot more slow?