Great performance score, how long does the battery last?

The iOS 26.4 Beta 4 update brings powerful multi-core performance and stable battery life, giving iPhone users complete peace of mind when upgrading.

The iOS 26.4 Beta 4 update has just arrived with a capacity of about 1.28 GB, bringing with it the expectation of an almost perfect version before Apple releases the official version (RC). Unlike the first test versions, which often had temperature problems, Beta 4 shows a clear change in the way Apple coordinates the power of the A19 Pro chip.

Actual experience after installation shows that the system operates extremely fluidly (smoothly), responds instantly and especially the stability of the battery is the biggest concern of the iPhone user community today.

Actual performance: Multi-core power approaches 10,000 points

Regarding processing power, iOS 26.4 Beta 4 recorded extremely impressive Benchmark numbers. Through the Geekbench 6 test on the iPhone 17 Pro Max series, the device scored about 3,745 single-core points and reached 9,924 multi-core points. This is an extremely positive result for a test version, proving that the combination of new generation hardware and software has achieved very high compatibility.

Every action from surfing the web on Safari, opening the App Store or handling complex Apple Intelligence features goes smoothly, with almost no lag.

The next valuable plus point lies in the ability to manage RAM and graphics. ProMotion 120Hz technology operates stably, the phenomenon of dropped frames when scrolling or multitasking has been completely resolved.

Although sometimes there is still a slight lag right after unlocking the device and swiping the screen immediately, overall the overall performance experience of Beta 4 feels very premium and reliable.

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Battery life: Stable throughout a long working day

Battery life on iOS 26.4 Beta 4 has shown very positive signs after the energy draining period of the first Beta versions. Actual records show that the device consumes about 78% of capacity for nearly 5 hours of continuous use (On-screen) with mixed tasks from playing games, watching movies to working via email.

If you only use light daily tasks, your iPhone can last for more than 10 hours of use, an ideal number for business trips or travel without the need for a backup charger.

Besides, Apple seems to have completely resolved the “System Data” error that took up abnormal memory and caused the battery to drain quickly. The device temperature during use and charging also remains cool, showing that the vapor chamber cooling system on new models has been very well optimized by the software.

Although there is still a small error in displaying the battery graph in the Settings section, it does not affect the actual usage time of the device.

Updated new Modem and super fast connectivity

An important detail that cannot be overlooked is that Apple has updated the new Modem Firmware in this Beta 4 version. This change is aimed at stabilizing Wi-Fi 7 and 5G connections, making data transmission in areas with weak signals smoother.

The speed of searching and downloading applications on the App Store has also returned to a “speedy” state, with no waiting cycle like in Beta 2 and Beta 3.

In short, if you are in the old Beta versions and feel your device heats up quickly or the battery drains quickly, upgrading to iOS 26.4 Beta 4 is extremely worthwhile. With strong performance and stable battery life, this is the perfect buffer for iFans to prepare for the launch of groundbreaking AI features in the official version later this month.

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