Usually, slippage occurs if you use a large amount of order. In the process of execution, a market order is executed at several prices at once, "taking" the best orders in the order book. Rare and dangerous type of slippage occurs in a volatile market, when the order book contains “voids” because of “whales of market”.
If you place market orders on Bitfinex, then you should learn the hotkeys:
- close at market;
- Buy/sell at market price;
- Reverse the position.
Limit orders slipping is the important thing for these hotkeys. It is specified in the decimal pricing option. The parameter value can be changed in the tickers settings. The value is 0, which means that the order will be sent to the edge of the order book.