I've been testing frigate the last couple of weeks. Been interesting. Obviously I don't have a coral tpu device due to the global shortage but had surprisingly good inference speeds on cpu. It works very well for people in daylight.
90ms or so on both my Intels with 4 cameras.
Tested on a lxc container on proxmox and on desktop docker on windows. Both worked reasonably well. Oddly the frigate on the proxmox with an i5 4th Gen worked just as well as the i7 7700 docker on windows. I think the one on proxmox actually used less cpu power despite the older Intel.
Blue iris is my main system with deepstack gpu gtx 970.
My BI works very well at night and this is where frigate falls short. I believe you need very good colorvu cams for frigate.
Looking forward to getting a coral tpu next year if they ever become available.