Does live wallpaper drain battery on a MacBook?

A video wallpaper does cost a MacBook some battery. It decodes something like 30 new frames every second for as long as it plays, which is why Wallper, Wallspace and 4K Live Wallpaper pause on their own when you unplug. Apple's own dynamic wallpapers only swap between a set of still pictures through the day. My app, Orbit, draws one still picture of the sky a minute, and on my Mac mini it averaged 0.04% of one CPU core and 22 MB of memory.

I measured it on an M6 Mac mini at 1080p, a computer with no battery at all. So these are CPU and memory numbers, not battery hours, and I haven't measured the GPU yet. The steps to check any wallpaper on your own MacBook are further down.

How much battery does a live wallpaper use?

I couldn't find a published battery test for any Mac wallpaper. The nearest thing is Wallper's own estimate that a 4K video wallpaper adds roughly 1 to 3 percent to a Mac's background power draw, compared with a plain colour, given in its FAQ as an estimate. Its published test, which I come to below, measured CPU and memory rather than battery.

On a Mac, "live wallpaper" covers several different things (how to get a live wallpaper on a Mac compares them), and their costs are miles apart.

Video wallpapers loop a video behind your icons. Most of that work skips the main CPU cores, because Apple silicon has a video decode engine built for this one job. The CPU column stays small for a well-made one, while the decoder and the window server (the part of macOS that puts every window on screen) work on every frame.

To be fair, video is one of the cheaper things a Mac does: Apple rates the MacBook Neo at up to 16 hours of video streaming against 11 for wireless web. Still, Wallper, Wallspace and 4K Live Wallpaper pause on battery, and Backdrop pauses behind full-screen apps.

Apple's built-in Dynamic wallpapers brighten and darken with your time of day. Mojave's desert was one image file of 16 stills (as NSHipster found), swapped as the Sun moves, with nothing playing in between. I haven't seen anyone measure one, but there's almost nothing there to cost.

Plash makes any website your wallpaper, and it costs whatever the page costs: a photo is cheap, a page full of scripts and animation isn't. It can switch itself off on battery.

Orbit is another kind, a still picture that updates. Once a minute it works out the real sky over your city and paints one ordinary picture, then does nothing until the next minute. With the desktop in view all day, that's 1,440 pictures against 2,592,000 frames for a video at 30 frames a second.

Does live wallpaper affect performance on a Mac?

On the CPU, barely, if the app is well made. The one maker's test I found with its method written down had a 4K video wallpaper at 1.46% of one core, and Orbit averaged 0.04% on my Mac mini.

That test is Wallper's: an M4 Mac mini, an ultrawide display and a 4K loop, sampled every 2 seconds for 90 seconds. Its busiest sample hit 4.40% of one core, and the app held about 55 MB. There are no battery figures, because a Mac mini has no battery, and Wallper says so plainly: "no battery percentages were invented for this article". Credit to them. Mine has none for the same reason.

Orbit's 0.04% came from five idle minutes with the desktop in view (0.60% in its busiest 5 seconds), in an optimised build like the one that ships, on macOS 27.0, with another busy app running beside it. That's two Macs and two different tests, so read it as a rough comparison. The gap comes from how often each one has work to do: a video every frame, Orbit once a minute.

Check the units before you compare anyone's numbers, though. Activity Monitor counts each CPU core up to 100%, so a 10-core Mac can show 1,000% (Howard Oakley explains). Backdrop advertises under 0.3% CPU, which its footnote says was 3% of one core spread across a 10-core M1 Max. Wallper's figures and mine are per core.

Energy Impact, Oakley notes, counts the CPU cores' power and not the GPU's, so a busy decoder or graphics chip barely shows there.

Here is everything I measured, with the conditions for each number.

How I kept Orbit's CPU and memory down

When I picked this idea on 27 September I had one condition: it must never slow my Mac down, because I work on my other projects on the same machine. So the budget came before the sky: under 1% CPU when idle, under 60 MB, animation only for real events (in 1.0, only the station's pass), and a full stop when the desktop is hidden or the battery is low.

On memory, a standard menu bar popover and a SwiftUI Canvas each added about 40 MB or more every time the card opened, until I swapped them out. I tell that story in how my first Mac app got through App Review.

One picture a minute

The sky turns a quarter of a degree a minute, about 4 pixels on a 1080p screen. Drawing more often would buy nothing you'd see. Orbit's only timer fires a second after each whole minute, with ten seconds of slack so macOS can bundle the wake-up with others.

Drawing one 1080p picture takes 7 to 8 thousandths of a second at full priority in the optimised build. Orbit asks macOS for low priority, though, and waits behind whatever you're doing. In my test builds that stretched a redraw to between 15 and 46 thousandths, depending on how busy the Mac was. Then Orbit sleeps for the rest of the minute.

⊕ Inspect the image

A closer look

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A dark night sky facing south with thin constellation lines. A gibbous Moon labelled 'Moon · 72%' sits near the centre, Saturn is labelled at upper left, Fomalhaut lower centre and Altair upper right, with compass marks SE, S and SW on the dark hills along the bottom.

⊕ Inspect the image

A closer look

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The same southern view an hour later. The Moon, now labelled 'Moon · 73%', has moved to the right and slightly lower, Saturn has climbed higher and moved right, Fomalhaut has moved right, and Altair sits at the right edge.

Nothing drawn when nobody can see it

Each desktop window can tell when it's hidden: behind a full-screen app, the lock screen, the screen saver or a sleeping display. Then Orbit's own work stops, with no timer and nothing fetched, until the desktop comes back and it draws once. Paused, it measured 0.00% CPU over 150 seconds and 19 MB of memory.

The lock screen is the only one I've tested; the others use the same signal.

That pause once kept a real pass off my desktop. On 1 October, with the app's clock set forward to the evening, that night's Los Angeles pass (due at 7:24 PM) was played behind my lock screen at a quarter to three in the afternoon, Los Angeles time. When the real pass came round, the desktop was out of sight, so Orbit had paused, as designed, and the pass never appeared.

Unplugged and under 20% charge, Orbit stops drawing altogether. Above 20% it keeps drawing on battery, unlike the video apps that stop when you unplug. The 20% isn't a setting, and I've never seen this pause happen, because my Mac mini has no battery.

The station moves without waking the app

During a visible pass the space station crosses the desktop as a small layer above the still picture. Orbit hands macOS the station's whole path once, and the window server moves it without waking Orbit at all. The sky redraws as usual once a minute, plus once as the pass begins, to turn and face it, and once as it ends, to turn back.

Over a 617-second pass (a test pass, with the clock set by hand) Orbit read 0.0% CPU in every sample but the minute's redraw. It asks for at most 30 frames a second. The real rate is the window server's business.

This clip is a demonstration drawn by Orbit's renderer over New York, not today's live pass and not a camera feed.

How to check any wallpaper app in Activity Monitor

You don't have to take my word, or any maker's. These steps follow Apple's own guides, plus Howard Oakley's notes on what the numbers mean.

Live wallpaper on a MacBook Air or MacBook Neo

The MacBook Neo, Apple's laptop from March 2026 ($599 at launch, $699 since June), has 8 GB of memory and a 36.5 watt-hour battery, about two thirds of the 53.8 in the 13-inch MacBook Air. On a machine that size every app's memory counts. Wallper's app held about 55 MB in its test, and Orbit held 22 MB on my Mac mini, about a quarter of one percent of the Neo's 8 GB.

Orbit needs macOS 15 or later. The Neo launched with macOS Tahoe, which is newer, and any MacBook Air running macOS 15 or later will do too. I haven't run Orbit on either.

How to stop a live wallpaper draining your battery

Turn on the app's pause-on-battery switch if it has one (several video apps come with it on), and quit the wallpaper when you're on battery and don't need it. Going by how they work, a plain still or one of Apple's dynamic wallpapers has the least to do, and a video wallpaper with pause-on-battery left on is a fair deal.

If you'd rather have the sky that's overhead right now, I made Orbit: Live Sky Desktop for that. It draws the real sky over your city once a minute, space station passes included, and stops drawing when nobody can see the desktop. It's $6.99 once (₹699 in India), with no subscription or in-app purchases, for macOS 15 or later on Apple silicon and Intel. Screenshots are on the Mac page, and I wrote about living with it too.