BUG / FEATURE REQUEST: Slow upload speed, no way to change baud rate

[Dr Creeper 4]

I am programming using UiFlow 2.0 on my M5Stack Stick C Plus 2.

When I burn UiFlow 2.0 using M5Burner, the tool shows esptool being used, which reports the file size being ~20KB.
This is very fast (less than 10 seconds).

When I use UiFlow 2.0's web interface to upload via a USB COM port, however, my file is ~20KB, It is very very slow (~90 seconds).

It would greatly benefit me (and others) to have the option to change the baud rate.

EDIT:
I almost forgot, the issue also happens when I upload a file from the web terminal.
There is also an issue when I upload a file or script, it results in an empty (0 Bytes) file! (most of the time)

EDIT 2:
I found a partial solution to my problem:
I find that the files have a smaller chance to be uploaded empty when you shut down the device using the power button,
then plug the device without turning it on and upload files that way.

The upload speed is still very slow.