Oh! You mean the scanning speed. I thought you was talking about the original PDF preview. For now, scanning is using emscriptened ImageMagick Wasm. Due to the

Oh! You mean the scanning speed. I thought you was talking about the original PDF preview. For now, scanning is using emscriptened ImageMagick Wasm. Due to the translation from C++ to Wasm, the scanning speed is very slow. Maybe re-writing blur, rotate and noise algorithm will speed up the scanning.