Hi,
updated to latest cli and I am running ìonic lab command. Following is the cli output
Date: 2019-01-30T11:53:51.562Z - Hash: c1a6384c5e078fc39d98 - Time: 4448ms
[ng] 181 unchanged chunks
[ng] chunk {intro-intro-module} intro-intro-module.js, intro-intro-module.js.map (intro-intro-module) 7.17 kB [rendered]
[ng] i ｢wdm｣: Compiled successfully
4 seconds is too long for the refresh. It was very fast in v3. I am on Dell XPS 15 with i7, 16 GB RAM and 512GB SSD.