How I resolved the issue where Android, especially LINE, was unusually slow on a BUFFALO router
The other day, when I changed my wife's parents' Wi-Fi router to BUFFALO's "WSR-1800AX4S/NBK",
the feedback was that "LINE was slow to load".
Her parents were using "Galaxy S10" and "OPPO Reno A", and her sister's iPhone had no issues.
When I actually went to check, indeed, iPhones had no problems, but only Android devices were somehow slow.
Push notifications were also sometimes delayed, sometimes not.
Especially LINE, which is likely used frequently
Notifications arrived immediately, but chats were slow to update
※Screenshots are for illustration purposes. The phenomenon occurred on Android.
Stickers were slow to load and sometimes didn't display
※Screenshots are for illustration purposes. The phenomenon occurred on Android.
Indeed, only Android devices were somehow slow...
When I tried connecting to 4G, it loaded immediately, so I concluded the problem was with the router and decided to dig into the settings.
Settings that resolved the issue
How to access the router settings is written in the instruction manual
Under "Wireless Settings" > "5GHz", there's a setting called "Speed Mode".
By default, it was set to the maximum "80MHz", but
When I tried setting it to "20MHz", it started loading without issues even on Android!
Since there were no issues even after setting it to "40MHz", I ultimately decided to set it to "40MHz".
If you are connected to a 2.4GHz SSID, please make the settings under "Wireless Settings" > "2.4GHz".
For these kinds of issues, there are various factors such as compatibility between devices, routers, ONU equipment, and even the house structure, making it difficult to pinpoint the exact cause.
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