Slippage is a normal phenomenon in DeFi. It looks more accentuated in the middle and end of December.

A curious fact about that chart is that swaps were more common in November than in December. There is an idea that swaps increase in December because customers want to buy gifts or travel during the holidays.

Maybe learning from past years, customers began to do so one month later.

At the end of November and beginning of December 2022, there was a high demand for swapping Bitcoin for altcoins. However, near the change of the year, Bitcoin became more in demand

When the value is above 0, slippage is greater when selling BTC and below 0 when buying. It shows that the BTC price tends to vary more when swapped for other altcoins during the purchase