What is slippage?

Usually apparent in highly volatile markets, slippage represents the expected % difference between the quoted price and executed price. Low liquidity can also cause slippage, which is why larger orders tend to face higher slippage. (source)

In the graph below, we can see the average and the median % slippage of different swap size brackets. As can be seen, small swaps between 0 and 10k USD in value, have very small slippage between 0.02% and 0.07%. However, it is apparent that the % slippage increases as the swap sizes increase. Above a swap size of 500k USD, the % slippage does not seem to increase anymore. You can expect to have 4%-10% slippage when making swaps above 500k in value.