Improve speed of printing via bluetooth?

[marcgug]

Description

Long delay when printing via bluetooth: 4-5 seconds

Your device where the bug occurs

• Device: iPad Gen 9
• OS: iOS 18.3.1
• Version: 2.8.0

Your printer

• Model Names: TSP100III
• Firmware Version: 3.0
• Interface: Bluetooth

Your development environment

Mac OS 15.3.2

Additional context

Is there any way to speed up printing via bluetooth? I have added timing logs and it takes 4-5 seconds from the time of making the StarPrinter(.bluetooth, address) command to actually completing the printer.print() command. Here is an excerpt what my code looks like:

  guard let address: String = Defaults.object(for: .starMicronicsPrinterAddress) else { return showAlert() }
    
    let startTime = measureStart()
    Log.verbose("Starting StarMicronics printer operation", context: "StarMicronics")

    let cb = StarXpandCommand.StarXpandCommandBuilder()
    let db = StarXpandCommand.DocumentBuilder()

    _ = cb.addDocument(cmd(db))

    let command = cb.getCommands()

    let printer = StarPrinter(.bluetooth, address)

    Task {
      do {
        Log.verbose("Attempting to open printer connection", context: "StarMicronics")
        let openStartTime = measureStart()
        try await printer.open()
        measure(openStartTime, "Printer open")
        defer { Task { await printer.close() } }
        
        Log.verbose("Sending print command", context: "StarMicronics")
        let printStartTime = measureStart()
        try await printer.print(command: command)
        measure(printStartTime, "Print command execution")
        
        measure(startTime, "Total StarMicronics operation")
        Log.verbose("Success", context: "StarMicronics")
      } catch let error {
        measure(startTime, "Total StarMicronics operation (failed)")
        Log.error(error, context: "StarMicronics")
      }

Any suggestions on how to speed up printing would be greatly appreciated. Thanks!