I've tested it for half a day and it triggered me so much I had to stopped... I really wanted to like it. Get away a bit from Google, promote the open-source and all. Maybe next time.
My local project takes 900ms (with all dev profiling included on Chrome) but loads in not less than 4.5s on Firefox 57. Additionally, I get 137% of CPU usage with 3 tabs. Just unusable for working. 😔
I hope it's just a bug that will be fixed. I'll try again in a few weeks. 🙌