Most ISPs oversubscribe their networks, they sell more bandwidth to subscribers than the backbone can deliver simultaneously. Statistically, this works because not everyone uses peak speed at once. Between 7 PM and 11 PM, when households fire up Netflix, that assumption breaks and shared infrastructure (the local node, regional aggregator) becomes the bottleneck.
Your local cable or fiber segment is shared with neighbours. When everyone streams 4K and games at the same time, the segment saturates and per-customer speeds drop. This is congestion, not throttling.
No. Throttling is your ISP intentionally slowing specific traffic (like video). Congestion is just too many users on the same shared link. Test both with a VPN to tell them apart.
You can't fix the shared upstream, but you can mitigate impact: enable SQM on your router, schedule big downloads outside 7–11 PM, and prefer wired connections for gaming and calls during that window.
Sometimes. A higher tier may put you on a better-provisioned segment. But if congestion is severe, switching from cable to fiber usually helps more than upgrading speed.
Pinpoint whether your evening slowdown is local WiFi, ISP congestion or throttling in 10 minutes.
If the VPN is significantly faster, your ISP is shaping or throttling specific destinations.
Run a test on WiFi from the same room. A big WiFi-only drop means the issue is your local 2.4 GHz channel, not your ISP.
If wired speeds stay under 50% of plan during peak for several days, send screenshots to support and ask for a node check.
Why your internet crawls between 7 and 11 PM, network congestion vs ISP throttling explained, and the realistic fixes that actually speed things back up.