📦 Your CSV Might Be Using Twice the Memory It Needs

Open a CSV in Pandas.
Run:

df.info()

You'll often notice many text columns have the type:

object

If a column contains repeated values like:

London
London
London
Paris
Paris
Berlin

convert it to:

category

Instead of storing the full text every time, Pandas stores each unique value once and references it internally.

On large datasets, memory usage can drop dramatically.