Which net is fastest in dong ICO?

Hi , i did the ICO on main network , it is extremely slow and cost a lot . it keeps asking me to pay gas . who kindly can give me some hints ?

Try core POA Network: 5 seconds blocks issuing, 3 times cheaper then Mainnet.
RPC endpoint in MetaMask: https://core.poa.network.
Guide how to connect to POA Network in Metamask

How slow was it on mainnet?

Deployment time estimations: https://github.com/poanetwork/token-wizard/wiki/Token-Wizard-Deployment-Time-and-Gas