Photoshop slow or laggy? Fix it with these settings
Most performance problems come from three places: GPU drivers, scratch disk, and memory. All three are configurable.
1. Start with the graphics processor
Open Edit → Preferences → Performance. If the canvas flickers, turns black, or brushes stutter, uncheck Use Graphics Processor and test again. If that instantly fixes the behavior, your driver is the problem, not your hardware: update it from Intel, AMD or NVIDIA and re-enable acceleration. Disabling acceleration permanently is only a workaround for very old cards.
2. Give it a real scratch disk
Under Scratch Disks, choose an NVMe or SSD with 20 GB or more free. Never use a nearly-full system drive, a USB stick, or a synchronised folder like OneDrive. Scratch files are constant random writes, and a slow scratch disk makes even a powerful machine feel broken with large documents.
3. Tune memory and history
Set memory usage to roughly 70% of installed RAM. More than that starves Windows itself. Reduce History States from the default to 20–30 on machines with 8 GB of RAM: every state multiplies the size of your working document in memory. Increase Cache Levels for huge panoramas and lower it for small web graphics.
4. Stop the background competition
Cloud-sync clients, browser tabs using WebGL, and antivirus real-time scans of the scratch folder are the usual hidden cost. Exclude the scratch directory from scheduled AV scans, and never place it in a synced folder.
Instant diagnosis: if nothing is running and Photoshop is still slow, open Task Manager during a lag spike. Full RAM means scratch tuning; 100% disk means scratch or sync; constant CPU means filters or background agents.