This is an extraction of the very important information from my thread on the Evo LTE. ( http://forums.androidcentral.com/htc-evo-4g-lte/177470-do-not-use-best-wi-fi-performance.html ) I believe this might also apply to the USA One X. Please post your findings, either way.....
WARNING: DO NOT TURN ON THE "Best Wi-Fi performance" setting!!! It will DESTROY your battery life by consuming tons of CPU and keeping the CPU awake all the time, regardless of if you are using the phone or not. This has nothing do to with other settings such as "Keep Wi-Fi on during sleep" (which I have set to "Always" with no problem other than it doesn't keep it connected). I have tested this several times now, and have confirmation from numerous other users.
With the setting on, you will notice a battery drain of 200 to 300% faster. Under power-> battery use you will see unusually high "Android OS" percents. When clicking on that, you will see high "CPU total" and very, very high "Keep awake" times..... in fact, the "Keep awake" time will almost mirror your on-battery time.
After searching high and low, I can find no definitive explanation of exactly what that "Best Wi-Fi performance" setting really does, anyway. The word "performance" is meaningless- could be bus speed, chip speed, negotiated speed, battery impact, awake times, connect times, transmit power levels.... just about anything. Some users (and later HTC in a phone call to me) claim the option really does extend WiFi range. Hopefully HTC will fix this or at least disable the option if it cannot be fixed.
It has also been reported to HTC as a problem (for the Evo LTE), who claims it is "expected" behavior but recommend it is only used temporarily, for short times when you need a boost in WiFi range. If you find this same behavior on the One X, do share it below. And also report it to HTC here: HTC Smartphones and Tablets - Support for HTC Cell Phones and Tablets
WARNING: DO NOT TURN ON THE "Best Wi-Fi performance" setting!!! It will DESTROY your battery life by consuming tons of CPU and keeping the CPU awake all the time, regardless of if you are using the phone or not. This has nothing do to with other settings such as "Keep Wi-Fi on during sleep" (which I have set to "Always" with no problem other than it doesn't keep it connected). I have tested this several times now, and have confirmation from numerous other users.
With the setting on, you will notice a battery drain of 200 to 300% faster. Under power-> battery use you will see unusually high "Android OS" percents. When clicking on that, you will see high "CPU total" and very, very high "Keep awake" times..... in fact, the "Keep awake" time will almost mirror your on-battery time.
After searching high and low, I can find no definitive explanation of exactly what that "Best Wi-Fi performance" setting really does, anyway. The word "performance" is meaningless- could be bus speed, chip speed, negotiated speed, battery impact, awake times, connect times, transmit power levels.... just about anything. Some users (and later HTC in a phone call to me) claim the option really does extend WiFi range. Hopefully HTC will fix this or at least disable the option if it cannot be fixed.
It has also been reported to HTC as a problem (for the Evo LTE), who claims it is "expected" behavior but recommend it is only used temporarily, for short times when you need a boost in WiFi range. If you find this same behavior on the One X, do share it below. And also report it to HTC here: HTC Smartphones and Tablets - Support for HTC Cell Phones and Tablets
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