Slow Macbook Pro with using iPhoto

Download and run Etrecheck. Copy and paste the results into your reply. Etrecheck is a diagnostic tool that was developed by one of the most respected users here in the ASC and recommended by Apple Support to provide a snapshot of the system and help identify the more obvious culprits that can adversely affect a Mac's performance.

What Mac model size, year, type amount of RAM, what macOS and version of iPhoto ?

New problem old problem, add or change anything recently??