Long story short, my Internet speeds very suddenly dropped to about 4% of what I was previously getting and about 2% of the advertised maximum speed. Each and every attempt at getting the ISP to fix whatever broke is being declined and the excuse I’m getting is always “This is a best-effort service” (ベストエフォートサービス).
Now I’m wondering: surely this isn’t just a blank legal cop-out, no matter how bad the received service is? Or could they literally say “Shikatanai” as long as a single bit still barely makes it through the line? Is there a legally defined definition of “best effort”?
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You’ve already been through https://www.reddit.com/r/japanlife/wiki/internet and are using IPv6/IPoE, right?
Congestion is a thing, and yeah, ‘best effort’ really means what it means. These days if you’re on IPoE and your area isn’t congested otherwise, you should be getting OK speeds throughout unless there’s some issue with line – like you’re on VDSL and copper got damaged/something and instead of getting 100/100 you’re at 10/10 or worse.
quick edit: make sure you’re speed testing on ethernet and not wifi, if your current ‘issue’ is due to wifi situation changing, maybe redo site survey and pick unused channels in case someone moved in nearby / started a new access point etc.