Why is Revit slowing down?

February 2025

❝ Hated it when loading every morning. ❞

💥 I found large Revit families have big impact on Revit loading and the model file size.

So, I made a small Revit button that shows a list of families loaded in the model ordered by file size (MB) and allows to delete them.

My (biased) thoughts; it is cool that it also allows to filter the families not being used in the model.

📌 If you want to watch the video:

PS: This tool for pro members in nonicatab.

💻 Coding tip: To measure mb of families, I first exported to a temporary location and measure their file size with os.path.getsize(filepath).

About:

Jaime Alonso Candau

Director at Nonica.io

Open-Source Contributions to RevApiDocs.com, CivApiDocs.com, BIMEventsWorld.com, pyRevit and Dynamo.