Most ValidStitch slowness traces to browser-side state, not server-side load. Work through these in order before contacting support — the first three resolve roughly 80% of cases.
1. Reload with cleared cache
ValidStitch ships frequent updates. A stale JavaScript bundle in the browser cache can mismatch with the current API and cause render slowdowns or unresponsive UI. Fix: hard-reload with Cmd+Shift+R (macOS) or Ctrl+Shift+R (Windows). If still slow, fully clear ValidStitch's site data in your browser settings and reload.
2. Close other tabs
Embroidery file rendering is GPU-heavy. If you have 20+ tabs open, especially video / streaming tabs, ValidStitch is competing for GPU memory and renders lag visibly. Fix: close any tab you're not actively using. A 90,000-stitch design pans smoothly with five tabs open and stutters with thirty.
3. Turn on hardware acceleration
Some browsers disable hardware acceleration by default (or it gets turned off by an extension). Without it, the stitch canvas software-renders, which is much slower. Fix: in Chrome, Settings → System → 'Use graphics acceleration when available' → on. Similar settings exist in Safari, Firefox, and Edge. Restart the browser after toggling.
4. Network test
Upload progress that crawls usually means a slow connection or aggressive corporate firewall, not a ValidStitch problem. Fix: run a quick speed test. Upload speed under 5 Mbps will feel slow with any file over 5 MB. If you're on shop Wi-Fi with bandwidth-limiting, switch to wired or to a hotspot for the upload.
5. Browser version
ValidStitch supports the current and previous major release of Chrome, Safari, Firefox, and Edge. Older versions miss WebGL features the canvas relies on, which forces a software fallback. Fix: update your browser. The 'About' or 'Help → About' menu shows the current version.