Full bars ≠ good internet — full signal only means strong Wi-Fi between device and router, not that the internet is stable.
Main culprits:
High latency (slow response time)
High jitter (unstable delay)
Packet loss or ISP congestion
Interference or router overload
DNS slowness or bufferbloat from uploads
Good values:
Latency: <50 ms
Jitter: <10 ms
Packet loss: 0%
Fixes:
Change Wi-Fi channel or move to 5 GHz
Use fast DNS (1.1.1.1 or 8.8.8.8)
Limit upload-heavy users / enable QoS (Smart Queue)
Check router CPU and ISP link quality
In short:
Even with full Wi-Fi bars, lag happens if latency or jitter is high — often caused by interference, congestion, or slow ISP connection.
Main culprits:
High latency (slow response time)
High jitter (unstable delay)
Packet loss or ISP congestion
Interference or router overload
DNS slowness or bufferbloat from uploads
Good values:
Latency: <50 ms
Jitter: <10 ms
Packet loss: 0%
Fixes:
Change Wi-Fi channel or move to 5 GHz
Use fast DNS (1.1.1.1 or 8.8.8.8)
Limit upload-heavy users / enable QoS (Smart Queue)
Check router CPU and ISP link quality
In short:Even with full Wi-Fi bars, lag happens if latency or jitter is high — often caused by interference, congestion, or slow ISP connection.