I commented on a thread a couple weeks ago about Cloud Functions on GCP here: https://news.ycombinator.com/item?id=17796893

Eager to test it out we ran thousands of tests attempts with different RAM sizes and I can corroborate this persons findings in regards to the reduction of cold start time from functions with larger RAM allocations and seeming unpredictability of cold start on GCP. I hope with time they will improve cold start times or increase the minimum time for making a function "cold".