Using WordPress API to mass update posts freezes the server

This guy here got the following results doing something like “If you are importing a high volume of posts, go make a cup of tea. For this tutorial, I have created around ~1600 dummy posts. The progress bar below is up to 429/1600 after 4 minutes. It took around 15 minutes to complete the 1600 dummy test posts to write to the database via the API.”