Aside from checking the kernel log (sudo dmesg) and system log (sudo journalctl -xe) for any interesting messages, I might suggest simply watching for any processes which are abnormally high while the system is running slow. My initial approach would be to use htop (disable "Hide Kernel Threads" and enable "Detailed CPU Time"), and seeing which processes, if any, are eating up your CPU time. The colored core utilization bars at the top show how much CPU time is being spent on what: gray for disk wait, red for kernel, green for regular user process, etc. That information will be a good starting point.
I mean, there are plenty of wealthy immigrants here, but I would say there are probably more immigrant families from regular or (relatively) poor families around. Like, people with a regular income who are working a regular job, not your average finance expat from an English-speaking country on an all-expenses-paid expat package plus a neat half million bucks per year salary on top.
That said, the non-expat immigrants I know are overwhelmingly from eastern European countries, so I wouldn't be surprised if the acceptance policy is biased against non-Europeans. You don't see many average working-class Americans around here unless they married a Swiss person.
Again, that would be TIFF. TIFF images can be encoded either with each line compressed separately or with rectangular tiles compressed separately, and separately compressed blocks can be read and decompressed in parallel. I have some >100GiB TIFFs containing elevation maps for entire countries, and my very old laptop can happily zoom and pan around in them with virtually no delay.
I remember touring one of the Mercedes factories in Germany many years ago and it was the coolest fucking thing watching an army of robot arms putting cars together. Of course they've since stopped giving tours (and I think closed the factory altogether?), probably because manufacturing in China is cheaper. >:(
I have tried hosting a Tor relay on a VPS in the past and it was bottlenecked by the CPU at barely 20MB/s, although to be fair this was without hardware AES. More importantly for you, the server's IP started getting DDoSed constantly and a whole bunch of big internet services just immediately blocked the address (the list of relay IPs is public and many things just block every address on that list instead of only exit nodes). So any of your machines are probably at least somewhat up to the task (ideally if they have hardware AES support), but this is definitely not something I'd do on my home network.
I think they're on the end of the catwalk right above the small building in the corner, which would make sense since they'd have to appear in the middle of the sphere unless the image is cropped. Hard to be sure with this resolution, but I'd bet those few lighter pixels are the person holding the camera.
Aside from checking the kernel log (
sudo dmesg) and system log (sudo journalctl -xe) for any interesting messages, I might suggest simply watching for any processes which are abnormally high while the system is running slow. My initial approach would be to usehtop(disable "Hide Kernel Threads" and enable "Detailed CPU Time"), and seeing which processes, if any, are eating up your CPU time. The colored core utilization bars at the top show how much CPU time is being spent on what: gray for disk wait, red for kernel, green for regular user process, etc. That information will be a good starting point.