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Thanks for reaching out. Pls kindly see my comments as shown below:
Is the waveform in the figure you shared refer to the current go through the LED? From my understanding, you'll prefer a LED driver with shorter LED current rise and fall time?
You can first try to remove the 1Mohm resistor (R10 in the schematic) or change it to 10MHohm to see if there is any improvement for the LED current rise time.
