I have been using the RBGW Bulb since November and I find it incredible!
Since Google released its Assistant for all Android devices I wanted to use it to manage my lights by voice.
I tried using IFTTT and it works great.. But as other people stated I cannot use the Mi Home app to manage it. I have a lot of switches that I use to manage the bulbs and other plugs so it's impossible for me to switch over Singapore servers.
You wrote that the Chinese server is super slow, but how slow?
IMHO you could enable it because the gains of using IFTTT are definitely more than the pains generated by it being slow.
Also, the gains of being able to also use the Mi Smart Home ecosystem with the bulb and having IFTTT working (yes, even slowly) are more than the pains of not being able to use the Xiaomi Ecosystem but having a fast IFTTT.
Does this make sense?