PERF: read_csv should check if column is already a datetime column before initiating the conversion #52546
Closed
2 of 3 tasks
Labels
Arrow
pyarrow functionality
IO CSV
read_csv, to_csv
Performance
Memory or execution speed performance
Milestone
Pandas version checks
I have checked that this issue has not already been reported.
I have confirmed this issue exists on the latest version of pandas.
I have confirmed this issue exists on the main branch of pandas.
Reproducible Example
The read call takes 1.6 seconds, without parse dates it's down to 0.01 and pyarrow already enforces timestamp
This was introduced by the dtype backend I guess, so would like to fix soonish
Installed Versions
main
Prior Performance
No response
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