I launched an AWS EC2 instance in US East region (4 vCPU - 16 GB memory), installed Chrome and run Lighthouse on it. No difference with the result I had when running from Japan. The Time to interactive is still > 20 seconds.
Also tried with an AWS EC2 instance in Europe West region (Ireland, 4 vCPU - 16 GB memory). No difference.
Still wondering why @info50984 can get such a better result.