I have a relatively simple patch (~400 LOC changed) that touches 38 files. "git cl upload" of this patch takes 2 minutes 15 seconds on my gigabit connection. In https://chromium-review.googlesource.com/c/chromium/src/+/696765, an external contributor reports that they had a very difficult time getting this patch to upload at all.

This is the patch:
https://chromium-review.googlesource.com/c/chromium/src/+/705262

To repro:
git checkout -b test705262
git cl patch 705262
git cl issue 0
time git cl upload --bypass-hooks