There are a few things you can change when sending transactions.
Changing the gas limit.
All transactions made on the Ethereum chain require gas to complete. The gas limit is how many “units” it will take to complete a transaction. Leave this number as it is as setting it too low can cause your transaction to fail, wasting gas.
Changing the gas price.
Gas Price is how much Ether you are willing to spend per “unit” of gas. Increasing this number will mean your transaction is more expensive but will likely be completed quicker. Setting it lower means your transaction is cheaper but will take longer to complete.
Eth Gas Station is a great resource to use when sending Ethereum transactions in order to know what gas price to use and how long your transactions may take.