Smooth performance waiting for RC version!

iOS 26.4 Beta 4 brings smooth performance and stable battery life after 24 hours of hands-on experience, helping iPhone users wait with peace of mind for the official version.

The newly released iOS 26.4 Beta 4 update immediately attracted the attention of the technology-loving community when it carried a code ending in the letter “A”. In Apple tradition, this is a sign that this will be the final test before the company releases the Release Candidate (RC).

After exactly 24 hours of experience, the first impression this version leaves is “snappy” – extremely fast response speed and the feeling that the system has truly entered a stable orbit, ready for the upcoming breakthrough AI features.

Actual battery life after 24 hours: Solid for mixed needs

Regarding power management capabilities, iOS 26.4 Beta 4 gives quite balanced results although not really explosive. Through practical testing, the device consumes about 76% of the battery capacity but provides more than 5 hours of continuous use (On-screen).

It should be noted that during this time, users were mainly active on battery-consuming applications such as Instagram, TikTok, WhatsApp and running performance benchmarking tests. With such intensity of using social networks and watching videos, the number of more than 5 hours is considered a fairly stable level for a Beta version.

Normally, iPhone will need 2 to 3 days to fully optimize system files after updating. Therefore, users can expect battery life to improve even better in the coming days. If you only use common office and communication tasks, having the device last all day is completely within reach.

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Breakthrough performance and good news for the gaming community

Performance is the brightest point of this Beta 4 version. The feeling of swiping and transitioning scenes on the ProMotion screen is instant, with no more lag or dropped frames like previous trials.

CPU scoring results on Geekbench also showed a clear improvement: immediately after installation, the multi-core score reached over 8100 and quickly stabilized at a higher level after a few hours of use. This confirms that Apple has fine-tuned the coordination ability of the processor chip.

In particular, great news for those who regularly play games or process graphics is that the application crash error when scoring GPU on Beta 3 has been completely fixed. Current graphics scores are recorded at a very high and stable level, making every experience from heavy gaming to video post-production via Apple Intelligence smoother than ever.

The cooling system also works effectively when the machine only warms slightly during heavy tasks, no longer causing uncomfortable heat.

Forecast release roadmap and upgrade advice

With the current build code, we can be almost certain about Apple’s upcoming roadmap. As expected, the Release Candidate (RC) will be released around March 16 and the official iOS 26.4 version for all users will be released on March 23, 2026. This will be the time when Siri 2.0 with support from Gemini AI officially changes the way we interact with the iPhone.

In general, if you are on Beta 3 or older test versions, upgrading to Beta 4 is extremely necessary to fix GPU errors and improve smoothness. For users who are on the official iOS 26.3.1 version and want to experience the stability of build code “A” early, this version is also safe enough to install.

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