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Export for Screens and the Asset Export panel's Export encoded and wrote every file on the UI thread, so the window stopped responding until the last file was written. For 50 artboards in PNG at 1x, 2x and 3x, PDF and SVG (250 files, 47 MiB), the dialog's OK took a median of 43.8 s in a release build on Windows. With Enable Background Export on (Preferences › File Handling), OK now checks the settings, remembers them and takes a snapshot of the document, and the dialog closes. The thread that writes background saves and exports then encodes the files and writes them into the folder, or one ZIP in it, and the export progress dialog's Cancel stops it before the next file. The same OK takes under 0.001 s, and the files have the same names and bytes. With the preference off, without a folder, on the web and over MCP and scripts (document.exportForScreens and assets.export), the files are made at once with the same reply as before. Both commands report one progress step per file, so the progress dialog shows "File 3 of 250" and MCP progress notifications count the files in place of the encoders' artboards and pages. Docs: docs/target-app-parity.md, docs/control-protocol.md, docs/mcp.md.