Comment 154 for bug 1690719

Just some words from my own understanding, maybe incorrect:
No matter with or without threading, I think Daniel's work on performance is important.
They are focus on other performance issues that seems won't be fix by simply doing threading, and can also help on mouse lag.
Threading can fix mouse lag, but it does not means those performance issues can also be fixed by threading, they are just being masked by threading.
Sometimes metaphor can be really misleading, let us focus on the content of those MRs instead.