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iPhone 18 Pro Max storage slows under heavy use

Testing shows Apple's new iPhone 18 Pro Max, specifically the 1TB version, can see storage speeds fall as low as 1.1 megabytes per second when saving lots of data at once. That's because Apple switched to a denser, four-layer type of flash storage called QLC in high-capacity models, which sacrifices speed for space.

Why it mattersIf you move large files or shoot a lot of video, you could notice the slowdown. This trade-off mainly hits users of the 1TB model buying storage for heavy use, not just extra space.

Sources covering this

AppleInsiderHeadline onlyUnsurprisingly, iPhone 18 Pro Max SSD will slow down when hammered12:28 PMTom's HardwareiPhone 18 Pro Max storage can drop lower than a hard drive at 1.1 MB/s during heavy writes — QLC NAND offers higher capacity but reportedly suffers 38% drop compared to TLC-based Pro5:34 PM

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