Hi

I have a Raspberry Pi 4 and a guide camera QHY 5L-II-M. It is detected perfectly on RPI, but it seems that transfer speed is very low, ~3.5MB/s. This gives downloading delay after exposure ~0.4-0.5s, making use it for guidance questionable. When I connect camera to a big computer, it works just fine (0.07-0.09s downloading time). lsusb -t shows speed 480 Mbps on RPI, so I am out of ideas how to make it works faster.

I would appreciate any help/suggestions/etc.

Here's my settings, running on a RPi4 - perhaps worth comparing with what you have at the moment, I don't have a delay on my QHY5LII...

<INDIDriver>
<newSwitchVector device='QHY CCD QHY5LII-M-6057d' name='DEBUG'>
<oneSwitch name='ENABLE'>
Off
</oneSwitch>
<oneSwitch name='DISABLE'>
On
</oneSwitch>
</newSwitchVector>
<newNumberVector device='QHY CCD QHY5LII-M-6057d' name='POLLING_PERIOD'>
<oneNumber name='PERIOD_MS'>
1000
</oneNumber>
</newNumberVector>
<newSwitchVector device='QHY CCD QHY5LII-M-6057d' name='DEBUG_LEVEL'>
<oneSwitch name='DBG_ERROR'>
On
</oneSwitch>
<oneSwitch name='DBG_WARNING'>
On
</oneSwitch>
<oneSwitch name='DBG_SESSION'>
On
</oneSwitch>
<oneSwitch name='DBG_DEBUG'>
On
</oneSwitch>
<oneSwitch name='DBG_EXTRA_1'>
On
</oneSwitch>
</newSwitchVector>
<newSwitchVector device='QHY CCD QHY5LII-M-6057d' name='LOGGING_LEVEL'>
<oneSwitch name='LOG_ERROR'>
On
</oneSwitch>
<oneSwitch name='LOG_WARNING'>
On
</oneSwitch>
<oneSwitch name='LOG_SESSION'>
On
</oneSwitch>
<oneSwitch name='LOG_DEBUG'>
Off
</oneSwitch>
<oneSwitch name='LOG_EXTRA_1'>
Off
</oneSwitch>
</newSwitchVector>
<newSwitchVector device='QHY CCD QHY5LII-M-6057d' name='LOG_OUTPUT'>
<oneSwitch name='CLIENT_DEBUG'>
On
</oneSwitch>
<oneSwitch name='FILE_DEBUG'>
Off
</oneSwitch>
</newSwitchVector>
<newTextVector device='QHY CCD QHY5LII-M-6057d' name='ACTIVE_DEVICES'>
<oneText name='ACTIVE_TELESCOPE'>
EQMod Mount
</oneText>
<oneText name='ACTIVE_ROTATOR'>
Rotator Simulator
</oneText>
<oneText name='ACTIVE_FOCUSER'>
Focuser Simulator
</oneText>
<oneText name='ACTIVE_FILTER'>
ASI EFW
</oneText>
<oneText name='ACTIVE_SKYQUALITY'>
SQM
</oneText>
</newTextVector>
<newSwitchVector device='QHY CCD QHY5LII-M-6057d' name='UPLOAD_MODE'>
<oneSwitch name='UPLOAD_CLIENT'>
On
</oneSwitch>
<oneSwitch name='UPLOAD_LOCAL'>
Off
</oneSwitch>
<oneSwitch name='UPLOAD_BOTH'>
Off
</oneSwitch>
</newSwitchVector>
<newTextVector device='QHY CCD QHY5LII-M-6057d' name='UPLOAD_SETTINGS'>
<oneText name='UPLOAD_DIR'>
/home/astroberry
</oneText>
<oneText name='UPLOAD_PREFIX'>
IMAGE_XXX
</oneText>
</newTextVector>
<newSwitchVector device='QHY CCD QHY5LII-M-6057d' name='TELESCOPE_TYPE'>
<oneSwitch name='TELESCOPE_PRIMARY'>
Off
</oneSwitch>
<oneSwitch name='TELESCOPE_GUIDE'>
On
</oneSwitch>
</newSwitchVector>
<newSwitchVector device='QHY CCD QHY5LII-M-6057d' name='CCD_COMPRESSION'>
<oneSwitch name='CCD_COMPRESS'>
Off
</oneSwitch>
<oneSwitch name='CCD_RAW'>
On
</oneSwitch>
</newSwitchVector>
<newNumberVector device='QHY CCD QHY5LII-M-6057d' name='CCD_FRAME'>
<oneNumber name='X'>
0
</oneNumber>
<oneNumber name='Y'>
0
</oneNumber>
<oneNumber name='WIDTH'>
1280
</oneNumber>
<oneNumber name='HEIGHT'>
960
</oneNumber>
</newNumberVector>
<newNumberVector device='QHY CCD QHY5LII-M-6057d' name='CCD_BINNING'>
<oneNumber name='HOR_BIN'>
1
</oneNumber>
<oneNumber name='VER_BIN'>
1
</oneNumber>
</newNumberVector>
<newSwitchVector device='QHY CCD QHY5LII-M-6057d' name='CCD_STREAM_ENCODER'>
<oneSwitch name='RAW'>
On
</oneSwitch>
<oneSwitch name='MJPEG'>
Off
</oneSwitch>
</newSwitchVector>
<newTextVector device='QHY CCD QHY5LII-M-6057d' name='RECORD_FILE'>
<oneText name='RECORD_FILE_DIR'>
/home/astroberry/indi__D_
</oneText>
<oneText name='RECORD_FILE_NAME'>
indi_record__T_
</oneText>
</newTextVector>
<newNumberVector device='QHY CCD QHY5LII-M-6057d' name='RECORD_OPTIONS'>
<oneNumber name='RECORD_DURATION'>
1
</oneNumber>
<oneNumber name='RECORD_FRAME_TOTAL'>
30
</oneNumber>
</newNumberVector>
<newSwitchVector device='QHY CCD QHY5LII-M-6057d' name='CCD_STREAM_RECORDER'>
<oneSwitch name='SER'>
On
</oneSwitch>
</newSwitchVector>
<newNumberVector device='QHY CCD QHY5LII-M-6057d' name='CCD_GAIN'>
<oneNumber name='GAIN'>
1
</oneNumber>
</newNumberVector>
<newNumberVector device='QHY CCD QHY5LII-M-6057d' name='CCD_OFFSET'>
<oneNumber name='OFFSET'>
180
</oneNumber>
</newNumberVector>
<newNumberVector device='QHY CCD QHY5LII-M-6057d' name='USB_SPEED'>
<oneNumber name='SPEED'>
0
</oneNumber>
</newNumberVector>
<newNumberVector device='QHY CCD QHY5LII-M-6057d' name='USB_TRAFFIC'>
<oneNumber name='TRAFFIC'>
30
</oneNumber>
</newNumberVector>
<newNumberVector device='QHY CCD QHY5LII-M-6057d' name='USB_BUFFER'>
<oneNumber name='BUFFER'>
512
</oneNumber>
</newNumberVector>
</INDIDriver>