Update app.py

app.py

@@ -233,7 +233,7 @@ if __name__ == "__main__":
                         md_text = gr.TextArea(lines=45, show_copy_button=True)
         file.upload(fn=to_pdf, inputs=file, outputs=pdf_show)
         change_bu.click(fn=to_markdown, inputs=[pdf_show, max_pages, is_ocr, layout_mode, formula_enable, table_enable, language],
-                        outputs=[md, md_text, output_file, pdf_show])
+                        outputs=[md, md_text, output_file, pdf_show], concurrency_limit=4)
         clear_bu.add([file, md, pdf_show, md_text, output_file, is_ocr, table_enable, language])
 
     demo.launch()