The discourse around Photoshop and 8GB Macs tends toward two extremes. One camp insists it is totally fine; the other says 16 GB is the minimum and Apple is ripping people off. The truth is quieter and more situational than either of those positions. Photoshop on 8GB is real, workable software for a real class of work. It is also genuinely stretched by certain workflows. Understanding that line is the point of this guide.
The 8GB Photoshop reality
Here is where things stand in plain terms.
What works without complaint: JPEG and PNG files of any reasonable size, RAW files from modern cameras processed one at a time, PSDs under 200 MB with a modest layer count, and everyday retouching tasks including spot healing, curves adjustments, and content-aware fill. For portrait photographers, wedding shooters, and anyone doing standard image editing, 8GB handles this without drama.
Where friction starts: Layered composites with many adjustment layers, smart objects, and masks start to slow things down as they push past 300-400 MB. Photoshop begins writing to its scratch disk, the SSD-based overflow area it uses when RAM runs out, and SSD reads and writes are slower than RAM. You will notice it as a lag when switching tools, a beachball during complex operations, or a sluggish response when painting on large canvases.
Where the wall is: Large format composites, 4K photo manipulation, heavy use of Neural Filters, and batch processing pipelines will consistently hit the ceiling on 8GB. Neural Filters in particular load AI models into memory that compete directly with the working document. Running them on a 300 MB file while the system is already under memory pressure often results in long waits or outright failures. For this category of work, 8GB is genuinely constraining rather than inconvenient. For a broader look at managing memory across apps, the guide to the best Mac apps for 8GB systems is worth reading alongside this one.
Photoshop's memory model
To understand why Photoshop behaves the way it does, it helps to know how it actually uses your Mac's resources.
Photoshop claims a portion of your available RAM at launch. By default it targets around 70% of what macOS reports as available. On an 8GB Mac with the operating system and background processes already consuming 2-3 GB, Photoshop might have 3.5-4 GB to work with before it starts reaching for the scratch disk.
The scratch disk is Photoshop's overflow area. It is a portion of your SSD that Photoshop treats like slow RAM. When a document's working data exceeds what RAM can hold, Photoshop writes the overflow to the scratch disk and reads it back as needed. The M-series SSD is fast enough that this is not catastrophic, but it is noticeably slower than real RAM, and it also means your SSD is doing extra work and accumulating write cycles over time.
The History States panel is a quiet but significant source of memory pressure. Each history state holds a complete copy of the document at that point in time. At the default setting of 50 states, a 200 MB file can accumulate 10 GB of history data if you have been working for a while. Not all of it stays in RAM simultaneously, but more states means more pressure.
GPU acceleration offloads canvas rendering, zoom, and certain filter previews to the M-series GPU cores. Because Apple Silicon uses unified memory shared between CPU and GPU, enabling GPU acceleration does not add RAM cost the way it did on Intel Macs with discrete graphics. It genuinely helps performance without a meaningful memory trade-off.
The settings that actually help
Open Photoshop's Settings menu, choose Performance. Adobe's own Photoshop performance documentation covers these settings in full detail.
RAM allocation. On an 8GB Mac, set the slider to 70-80%. Going higher leaves less headroom for macOS and other apps. Going lower than 60% pushes Photoshop onto the scratch disk faster. Start at 70% and adjust from there.
History States. Reduce from the default of 50 to 20-30. You lose some undo depth, but the memory savings are significant for complex files. If your workflow rarely goes back more than ten steps, 20 states is plenty.
Cache Levels and Cache Tile Size. Cache Levels controls how many reduced-resolution versions of your document Photoshop keeps in memory for fast zoom previews. For small documents (under 50 MP), a setting of 4 with a tile size of 128K works well. For large documents, bump tile size to 1024K. Higher cache levels speed up screen redraws but consume more RAM. The defaults are often set conservatively; matching them to your actual file sizes makes a real difference.
GPU acceleration. Make sure it is on. Under Graphics Processor Settings, if your GPU shows as available, enable it. On Apple Silicon Macs it is rarely the source of problems and reliably improves canvas performance, zoom behavior, and filter previews.
Scratch disk location. Photoshop defaults to the startup disk. On a Mac with only one drive, that is fine. If you have an external drive connected, do not designate it as the scratch disk unless it is a fast NVMe drive; a spinning drive or a slow USB key will make things dramatically worse. Keep the internal SSD as scratch disk and make sure it has at least 20 GB free at all times when working in Photoshop.
None of these changes will turn an 8GB Mac into a 16GB one. But they can meaningfully shift where the friction line sits, particularly for files in the 150-300 MB range that are borderline without tuning.
The competitive context
It is worth being direct here: Photoshop is not the only credible option.
Affinity Photo from Serif is a native Apple Silicon application that handles RAW processing, layer-based editing, and most Photoshop-compatible workflows with significantly lower memory overhead. A layered document that pushes Photoshop to 3 GB of RAM will often run in under 1 GB in Affinity Photo. The application is a one-time purchase, not a subscription. The real trade-offs are the absence of Camera Raw, a smaller plugin ecosystem, and a learning curve for workflows built entirely around Photoshop conventions. But for photographers who find 8GB genuinely limiting in Photoshop, Affinity Photo is a serious tool and not a consolation prize.
Pixelmator Pro is Apple Silicon-native, deeply integrated with macOS, and notably lean on memory. It has grown substantially in capability and handles a meaningful range of photo editing workflows well. It is not a full Photoshop replacement for complex compositing or heavy professional use, but for photographers whose needs skew toward processing and retouching rather than multi-layer compositing, it covers most ground with far less system load. Both are worth looking at alongside the broader question of which apps are best suited to 8GB Macs.
The broader point: on a constrained machine, the assumption that Photoshop is the only path is worth questioning. Depending on your actual workflow, a lighter native alternative might cover 90% of what you do, and on 8GB that 90% will run more smoothly.
The "should I upgrade RAM or workflow" question
This is the most practical question and the one that gets the least direct answer online. Here is a framework for thinking about it honestly.
Upgrade your RAM if: you regularly work with files above 300 MB, you use Neural Filters frequently, you batch process large volumes of high-resolution files, or you run Photoshop alongside other memory-heavy apps (a browser with many tabs, video conferencing software, Lightroom for culling while Photoshop is open). In all of these cases, 8GB is a structural constraint rather than a configuration problem, and no amount of preference tuning will fully resolve it. See the full breakdown in the guide to 8GB vs 16GB Mac.
Optimize your workflow if: you primarily work with files under 200 MB, you occasionally hit slowdowns but mostly work without issue, you have not yet applied the Performance preference changes described above, or your machine is running other things in the background that you could close during Photoshop sessions. In these cases, behavioral changes and preference tuning often resolve the friction without spending money.
A useful self-test: open Activity Monitor, click the Memory tab, and watch the Memory Pressure graph while you work in Photoshop. Green means you have headroom. Yellow means meaningful pressure but not a crisis. Red during normal sessions is a clear signal that more RAM would produce sustained improvement. For more on reading that graph, see what memory pressure means on Mac.
The honest summary: 8GB Macs are real tools for real photographers. The ceiling is lower than on a 16GB or 24GB machine, but it is not so low that Photoshop becomes unusable. Know where your work sits relative to the friction line, apply the performance settings, and check the memory pressure graph before concluding that hardware is the bottleneck. In many cases it is not.