[Solved] Arduino IDE with Wemos D1 : very slow upload and hang

[Solved]
Using a higher bit rate solved the issue. Upload is running until the end.

Hi,

Since a few hours, uploads on a Wemos D1 mini are very slow and unable to run until the end. I’musing the Arduino IDE 1.8.1 on Ubuntu.
I’ve been testing it on 2 different and new Wemos boards.

Here is the view from the IDE : link

And the detailed log :

Sketch uses 315138 bytes (30%) of program storage space. Maximum is 1044464 bytes.
Global variables use 35668 bytes (43%) of dynamic memory, leaving 46252 bytes for local variables. Maximum is 81920 bytes.
/home/ron/.arduino15/packages/esp8266/tools/esptool/0.4.9/esptool -vv -cd nodemcu -cb 9600 -cp /dev/ttyUSB0 -ca 0x00000 -cf /tmp/arduino_build_838911/TAN_horaire_C6_Derv.ino.bin 
esptool v0.4.9 - (c) 2014 Ch. Klippel <ck@atelier-klippel.de>
 setting board to nodemcu
 setting baudrate from 115200 to 9600
 setting port from /dev/ttyUSB0 to /dev/ttyUSB0
 setting address from 0x00000000 to 0x00000000
 espcomm_upload_file
 espcomm_upload_mem
opening port /dev/ttyUSB0 at 9600
 tcgetattr
 tcsetattr
 serial open
opening bootloader
resetting board
trying to connect
 espcomm_send_command: sending command header
 espcomm_send_command: sending command payload
trying to connect
 espcomm_send_command: sending command header
 espcomm_send_command: sending command payload
 espcomm_send_command: receiving 2 bytes of data
 espcomm_send_command: receiving 2 bytes of data
 espcomm_send_command: receiving 2 bytes of data
 espcomm_send_command: receiving 2 bytes of data
 espcomm_send_command: receiving 2 bytes of data
 espcomm_send_command: receiving 2 bytes of data
 espcomm_send_command: receiving 2 bytes of data
 espcomm_send_command: receiving 2 bytes of data
Uploading 319296 bytes from /tmp/arduino_build_838911/TAN_horaire_C6_Derv.ino.bin to flash at 0x00000000
 erasing flash
 size: 04df40 address: 000000
 first_sector_index: 0
 total_sector_count: 78
 head_sector_count: 16
 adjusted_sector_count: 62
 erase_size: 03e000
 espcomm_send_command: sending command header
 espcomm_send_command: sending command payload
 setting timeout 15000
 setting timeout 100
 espcomm_send_command: receiving 2 bytes of data
 writing flash
................................................................................ [ 25% ]
................................................................................ [ 51% ]
................................................................................ [ 76% ]
......................

And a video of the board (blinking very very slowly !):

Any ideas are welcome !

Thanks !

Ron