Normally when you need CPU to get slower in chrome, set Performance > CPU

but slowest setting is 6 times slowdown

😱 But I do wanna get it slower !!

OK, let's do it

1. Activate Protocol Monitor

2. Close devtool and reopen it again

then select Protocol monitor

3. write code at bottom part

{"command":"Emulation.setCPUThrottlingRate","parameters":{"rate": 10}}
and property of rate is throttle down speed

just note for myself and other developers

ref.
https://zenn.dev/from_host/articles/2d91bf31807b57
(this article helped me a lot, thank you)